A few pages back someone asked about the audio commentary and whether there's any discussion of Jimmy in it.
Actually, yes. When Jimmy first appears, Simon Kinberg says that "He's barely in it, but Jimmy gives a great performance" to which Brett Ratner responds "Oh definitely. Second by second... per capita, it's the best performance in the movie."
However, I'm currently JUST past the scene where Cyke was killed, and there's been one other moment in the commentary that really bugged me...
According to Penn, when Storm says to Xavier that "There's something you're not telling us," everyone assumed she was referring to the cure. However, he says that actually, he's referring to the fact that Xavier has psychically sensed Jean's return! Holy CRAP! And you thought that Xavier was a jerk for dismissing Scott so easily before because he didn't get over Jean's death in 8 months... now he apparently knew everything about Jean's psychic activity (which might've given him a hint as to what was going on with Cyke, you'd think) and just didn't care!
There are other fun bits in the commentary so far, too, such as Ratner copping to the fact that they just used footage from the previous films whenever they show an exterior of the mansion (!) and Zak Penn and Simon Kinberg admitting that they have no idea what the exchange between Logan and Storm at Alkalai Lake is even about (!). Man, how much were they flying this thing on autopilot?