1. Conveyor belts + slow movement combos: If Link tries to walk half on a conveyor belt and half on a slow movement combo, then immediately tries moving any other direction, he gets stuck and cannot move again until no direction keys are pressed for a bit. This happens with the belt on the right half and slow movement on the left half, but not the other way around since neither combo takes effect then.
2. Water + solid corners: If holding left and up or left and down while moving around a corner while swimming, Link gets hung up on the corner.
Both only happen with diagonal movement off.