I caught several puns throughout, and there are several people in this forum who, apparently, do not know what a pun is. Wiki has very detailed examples, even spelling it out for you. I'm just teasing, but seriously, some of you don't.
After reading that Ross was giving out fake bonus points, I accepted this as a challenge and looked through things. The best candidate I found was at 3:58 in the video, "A giant bung... I'm not seeing an entrance!" Then, at 6:22, he says, "Ah, this is kinda a crappy entrance, huh?" Then a bit later something about 'bullshit'.
I think this is a brilliant pun, and it's spaced out a bit which, I think, makes people miss it. Unless you're like me and have a superior brain.
If it's the one Ross hid, then great! I want my name in the credits of your next video detailing just how awesome I am. If not, then I'll... I don't know, I'll have to think, but... it'll be something drastic! Either way, it's a pun.