When Donatello and Algi are in the Taxi car, you see Donatello colored as Michaelangelo in the right-hand corner.
When Leonardo unties April, he's colored as Donatello.
When Donatello says "Talk about great reception!", the background shows the streets. He's supposed to be on the Channel Six roof.
When Michaelangelo says "OK, so I put on the wrong mask", he's talking to Donatello. But Don's not supposed to be in this scene!
Donatello: I sure hope I find a few intelligent turtles in outer space, because there sure aren't too many of them here on Earth!
Episode included on the Teenage Mutant Ninja Turtles Season 4 DVD release.
Episode released on VHS also titled Beyond the Donatello Nebula, part of the Out of This World series of TMNT VHS.