When we first meet Scotty on Delta Vega and he is sitting at his desk (the first desk, NOT when he gets up and moves to the other one to talk about beaming), watch VERY CAREFULLY when he is talking to the little alien about food. Look in the very back of the shots with Pegg and the little alien during this moment. There’s a brightly lit area in the back of the room, and R2 is sitting right there. He’s damn near in the middle of the shot. He’s out of focus, but there is no doubt that it’s him. Best way to catch him: watch for when Pegg holds up his hand to mimic a bean when he says “You can eat a bean and you’re done”. When he holds up his hand, he blocks R2 from the shot. Look in the space between Scotty and the alien. R2 is sitting right there at the back wall.
Even more specific, there’s a plasma tv hanging on the wall in the background. Look for it. R2 is right under it.
