Okay, more impressive late night feat last night: President Obama coming on "The Colbert Report" to order Stephen Colbert's military haircut, or Jimmy Fallon getting Mark-Paul Gosselaar to come on "Late Night with Jimmy Fallon" in character as Zack Morris?
I have to go with the latter, myself. President Obama hasn't been media-shy(*), where in all the time I've known Gosselaar (going back to when he joined "NYPD Blue"), he's visibly winced when the phrase "Saved by the Bell" has been mentioned in his presence. He felt it was this huge stumbling block when he tried to transition into an adult career. I guess now that he's on his fourth or fifth show, he can have fun with it a little(**).
(*) It's at this point that I have to remind you about the No Politics rule. Talk about POTUS as comedian/TV presence, not about policy. Period.
(**) Speaking of MPG and having fun with audience perception, I was damn amused that the "Raising the Bar" season premiere was almost entirely devoted to his character's hairstyle, which everybody complained about last year, and featured a haircut as its major plot development.