This article contains a list of glitches from Sonic the Hedgehog 4: Episode II. Unless otherwise noted, all glitch names are conjectural. Many of them have not been confirmed by Sega.
List of glitches
While playing a stage, the player should reach the Goal, cross it, and start a Rolling ComboTag Action. If they look closely, they will see that there are two Tails at the same time.
In Sky Fortress Zone Act 2, if the player stops suddenly on a hill after running at a high speed at a precise moment, Sonic will stay in his "halting" animation forever. He won't fall to the bottom until a minute or two passes.
Stuck on the wall:
In Sylvania Castle Zone Act 1, the player should use the Rolling Combo, go through the water-running section and jump at a certain time. Sonic and Tails will then get stuck on a wall. If the player deactivates the move, they will be out of the glitch.
In White Park Zone Act 3 or Sylvania Castle Zone Acts 1-3, using the Submarine Combo at a specific point where the water level is low will cause Sonic and Tails to perform the submarine combo while Tails is outside the water.