diff --git a/src/Spectre.Console/Extensions/CalendarExtensions.cs b/src/Spectre.Console/Extensions/CalendarExtensions.cs
index 3d55649..8662626 100644
--- a/src/Spectre.Console/Extensions/CalendarExtensions.cs
+++ b/src/Spectre.Console/Extensions/CalendarExtensions.cs
@@ -74,7 +74,7 @@ public static class CalendarExtensions
             throw new ArgumentNullException(nameof(calendar));
         }
 
-        calendar.HightlightStyle = style ?? Style.Plain;
+        calendar.HighlightStyle = style ?? Style.Plain;
         return calendar;
     }
 
diff --git a/src/Spectre.Console/Widgets/Calendar.cs b/src/Spectre.Console/Widgets/Calendar.cs
index 280e94e..18f1589 100644
--- a/src/Spectre.Console/Widgets/Calendar.cs
+++ b/src/Spectre.Console/Widgets/Calendar.cs
@@ -82,7 +82,7 @@ public sealed class Calendar : JustInTimeRenderable, IHasCulture, IHasTableBorde
     /// <summary>
     /// Gets or sets the calendar's highlight <see cref="Style"/>.
     /// </summary>
-    public Style HightlightStyle
+    public Style HighlightStyle
     {
         get => _highlightStyle;
         set => MarkAsDirty(() => _highlightStyle = value);
@@ -155,7 +155,7 @@ public sealed class Calendar : JustInTimeRenderable, IHasCulture, IHasTableBorde
         _culture = CultureInfo.InvariantCulture;
         _highlightStyle = Color.Blue;
         _showHeader = true;
-        _calendarEvents = new ListWithCallback<CalendarEvent>(() => MarkAsDirty());
+        _calendarEvents = new ListWithCallback<CalendarEvent>(MarkAsDirty);
     }
 
     /// <inheritdoc/>
diff --git a/src/Spectre.Console/Widgets/Grid.cs b/src/Spectre.Console/Widgets/Grid.cs
index 7a14798..5799885 100644
--- a/src/Spectre.Console/Widgets/Grid.cs
+++ b/src/Spectre.Console/Widgets/Grid.cs
@@ -49,8 +49,8 @@ public sealed class Grid : JustInTimeRenderable, IExpandable, IAlignable
     {
         _expand = false;
         _alignment = null;
-        _columns = new ListWithCallback<GridColumn>(() => MarkAsDirty());
-        _rows = new ListWithCallback<GridRow>(() => MarkAsDirty());
+        _columns = new ListWithCallback<GridColumn>(MarkAsDirty);
+        _rows = new ListWithCallback<GridRow>(MarkAsDirty);
     }
 
     /// <summary>
diff --git a/src/Spectre.Console/Widgets/Paragraph.cs b/src/Spectre.Console/Widgets/Paragraph.cs
index 96012d4..5b884b3 100644
--- a/src/Spectre.Console/Widgets/Paragraph.cs
+++ b/src/Spectre.Console/Widgets/Paragraph.cs
@@ -68,8 +68,6 @@ public sealed class Paragraph : Renderable, IHasJustification, IOverflowable
 
         foreach (var (_, first, last, part) in text.SplitLines().Enumerate())
         {
-            var current = part;
-
             if (first)
             {
                 var line = _lines.LastOrDefault();
@@ -79,13 +77,13 @@ public sealed class Paragraph : Renderable, IHasJustification, IOverflowable
                     line = _lines.Last();
                 }
 
-                if (string.IsNullOrEmpty(current))
+                if (string.IsNullOrEmpty(part))
                 {
                     line.Add(Segment.Empty);
                 }
                 else
                 {
-                    foreach (var span in current.SplitWords())
+                    foreach (var span in part.SplitWords())
                     {
                         line.Add(new Segment(span, style ?? Style.Plain));
                     }
@@ -95,13 +93,13 @@ public sealed class Paragraph : Renderable, IHasJustification, IOverflowable
             {
                 var line = new SegmentLine();
 
-                if (string.IsNullOrEmpty(current))
+                if (string.IsNullOrEmpty(part))
                 {
                     line.Add(Segment.Empty);
                 }
                 else
                 {
-                    foreach (var span in current.SplitWords())
+                    foreach (var span in part.SplitWords())
                     {
                         line.Add(new Segment(span, style ?? Style.Plain));
                     }
@@ -198,13 +196,11 @@ public sealed class Paragraph : Renderable, IHasJustification, IOverflowable
         var lines = new List<SegmentLine>();
         var line = new SegmentLine();
 
-        var newLine = true;
-
         using var iterator = new SegmentLineIterator(_lines);
         var queue = new Queue<Segment>();
         while (true)
         {
-            var current = (Segment?)null;
+            Segment? current;
             if (queue.Count == 0)
             {
                 if (!iterator.MoveNext())
@@ -224,13 +220,12 @@ public sealed class Paragraph : Renderable, IHasJustification, IOverflowable
                 throw new InvalidOperationException("Iterator returned empty segment.");
             }
 
-            newLine = false;
+            var newLine = false;
 
             if (current.IsLineBreak)
             {
                 lines.Add(line);
                 line = new SegmentLine();
-                newLine = true;
                 continue;
             }
 
@@ -246,7 +241,6 @@ public sealed class Paragraph : Renderable, IHasJustification, IOverflowable
                     {
                         lines.Add(line);
                         line = new SegmentLine();
-                        newLine = true;
 
                         segments.ForEach(s => queue.Enqueue(s));
                         continue;
@@ -276,8 +270,6 @@ public sealed class Paragraph : Renderable, IHasJustification, IOverflowable
                 continue;
             }
 
-            newLine = false;
-
             line.Add(current);
         }
 
diff --git a/src/Spectre.Console/Widgets/ProgressBar.cs b/src/Spectre.Console/Widgets/ProgressBar.cs
index 099e700..2e6ea54 100644
--- a/src/Spectre.Console/Widgets/ProgressBar.cs
+++ b/src/Spectre.Console/Widgets/ProgressBar.cs
@@ -57,11 +57,6 @@ internal sealed class ProgressBar : Renderable, IHasCulture
             barCount = Math.Max(0, barCount);
         }
 
-        if (barCount < 0)
-        {
-            yield break;
-        }
-
         yield return new Segment(new string(bar, barCount), style);
 
         if (ShowValue)
@@ -99,14 +94,13 @@ internal sealed class ProgressBar : Renderable, IHasCulture
         {
             // For 1-bit and 3-bit colors, fall back to
             // a simpler versions with only two colors.
-            if (options.ColorSystem == ColorSystem.NoColors ||
-                options.ColorSystem == ColorSystem.Legacy)
+            if (options.ColorSystem is ColorSystem.NoColors or ColorSystem.Legacy)
             {
                 // First half of the pulse
                 var segments = Enumerable.Repeat(new Segment(bar, new Style(style.Foreground)), PULSESIZE / 2);
 
                 // Second half of the pulse
-                var legacy = options.ColorSystem == ColorSystem.NoColors || options.ColorSystem == ColorSystem.Legacy;
+                var legacy = options.ColorSystem is ColorSystem.NoColors or ColorSystem.Legacy;
                 var bar2 = legacy ? " " : bar;
                 segments = segments.Concat(Enumerable.Repeat(new Segment(bar2, new Style(style.Background)), PULSESIZE - (PULSESIZE / 2)));