diff --git a/osu.Game.Rulesets.Mania/Objects/Drawables/DrawableManiaHitObject.cs b/osu.Game.Rulesets.Mania/Objects/Drawables/DrawableManiaHitObject.cs
index c0eea3ce22..4e276fddb7 100644
--- a/osu.Game.Rulesets.Mania/Objects/Drawables/DrawableManiaHitObject.cs
+++ b/osu.Game.Rulesets.Mania/Objects/Drawables/DrawableManiaHitObject.cs
@@ -6,7 +6,6 @@ using OpenTK.Input;
 using osu.Framework.Configuration;
 using osu.Framework.Graphics;
 using osu.Game.Rulesets.Mania.Judgements;
-using osu.Game.Rulesets.Mania.UI;
 using osu.Game.Rulesets.Objects.Drawables;
 
 namespace osu.Game.Rulesets.Mania.Objects.Drawables
diff --git a/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs b/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs
index 68d2023109..f23fab6d1b 100644
--- a/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs
+++ b/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs
@@ -20,8 +20,8 @@ namespace osu.Game.Rulesets.Objects.Drawables
     {
         private readonly BindableDouble lifetimeOffset = new BindableDouble();
         /// <summary>
-        /// Time offset before <see cref="HitObject.StartTime"/> at which this <see cref="DrawableHitObject"/> becomes visible and the time offset
-        /// after <see cref="HitObject.StartTime"/> or <see cref="IHasEndTime.EndTime"/> at which it expires.
+        /// Time offset before the hit object start time at which this <see cref="DrawableHitObject"/> becomes visible and the time offset
+        /// after the hit object's end time after which it expires.
         ///
         /// <para>
         /// This provides only a default life time range, however classes inheriting from <see cref="DrawableHitObject"/> should expire their state through
diff --git a/osu.Game/Rulesets/Timing/DrawableTimingSection.cs b/osu.Game/Rulesets/Timing/DrawableTimingSection.cs
index 1f1abc9bb4..d759a7caa6 100644
--- a/osu.Game/Rulesets/Timing/DrawableTimingSection.cs
+++ b/osu.Game/Rulesets/Timing/DrawableTimingSection.cs
@@ -11,7 +11,6 @@ using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Drawables;
 using OpenTK;
 using osu.Game.Rulesets.Objects.Types;
-using System;
 
 namespace osu.Game.Rulesets.Timing
 {
@@ -84,7 +83,7 @@ namespace osu.Game.Rulesets.Timing
         private Cached<double> durationBacking = new Cached<double>();
         /// <summary>
         /// The maximum duration of any one hit object inside this <see cref="DrawableTimingSection"/>. This is calculated as the maximum
-        /// end time between all hit objects relative to this <see cref="DrawableTimingSection"/>'s <see cref="ControlPoint.StartTime"/>.
+        /// end time between all hit objects relative to this <see cref="DrawableTimingSection"/>'s <see cref="MultiplierControlPoint.StartTime"/>.
         /// </summary>
         public double Duration => durationBacking.EnsureValid()
             ? durationBacking.Value
diff --git a/osu.Game/Rulesets/Timing/SpeedAdjustmentContainer.cs b/osu.Game/Rulesets/Timing/SpeedAdjustmentContainer.cs
index b5973099d2..0024b3c9c8 100644
--- a/osu.Game/Rulesets/Timing/SpeedAdjustmentContainer.cs
+++ b/osu.Game/Rulesets/Timing/SpeedAdjustmentContainer.cs
@@ -7,8 +7,6 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Game.Rulesets.Objects.Drawables;
 using OpenTK;
-using System.Linq;
-using System;
 
 namespace osu.Game.Rulesets.Timing
 {