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 2 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.