- All-Star Cast: The Steam Rolled episodes featuring Guns of Icarus Online were part of an event sponsored by Polaris, so in addition to the Grumps the players include Markiplier, Jacksepticeye, PeanutButterGamer, Jesse Cox, Angry Joe and more.
- Approval of God: Temmie Chang, the sprite artist from Undertale on whom the Temmies are based, animated Ross and Barry showing up in Temmie Village.
- Missing Episode: About 3 hours of footage for Castle Crashers was lost after the computer they recorded it on had a blue screen of death. When this was discovered, they decided to replay the parts of the games that were on the recording that was lost.
- Throw It In!: Episode 7 of DreadOut ends with four minutes of Ross amusing himself while Arin and Danny take a bathroom break.
- What Could Have Been: Steam Train was supposed to have been a second show next to Jon and Arin's Game Grumps, until Jon's sudden departure. Now Danny is on both shows. There was a promo on RubberRoss' own channel which was never shown to the Game Grumps public at large.
Trivia / Steam Train