Since a couple of patches ago, certain sounds in-game are not stopping even if the thing which triggered them is cancelled. The most obvious example is when the a Recall cast is cancelled, the sound effect still plays its full duration. It seemed to be fixed last patch - but I've noticed it still not cancelling, particularly when using Pulsefire Ezreal skin.
Certain sounds on the champion select are also not stopping - such as the timer which warns you about needing to pick a champion. If the pick is cancelled due to a dodger - the timer warning still plays its full duration.
Also noticed that randomly in-game - you can hear the sound of turrets being attacked when you're nowhere near them. It's most noticable when you start running back in to lane from your base, as you're clearly not in combat but are hearing random hitting sounds.