I love Wolverine: First Class because it takes me back to the tail end of "my" era of the X-Men. Of course this also means I'm hypersensitive to errors that creep in. For instance, in #15 as Kitty harangues Logan incessantly, one of the things she says is, "I should have listened to Jean! She told me to ask Scott!"
Kitty came into the X-Men immediately after Jean was (first) killed on the moon, and Kitty had gone on to Excalibur long before Jean got better and rejoined.
So who is running around impersonating Jean during this issue?