Signing off until February, 'Chuck' gave Toobworld a big Christmas gift with the holiday-themed episode, "Chuck vs. Santa Claus": Reginald VelJohnson was a guest star, playing Big Mike's cousin. But even better than that... Al was Al Powell of the Burbank police department, Twinkie included. That means he was the televersion of the character VelJohnson played in the first two "Die Hard" movies!
This doesn't have to mean that the "Die Hard" franchise is fully incorporated into the TV Universe, just that most of the characters from those films also have lives in Toobworld. And for all those TV shows that made mention of the events in the "Die Hard" movies (or to the movies themselves), the movies could have been fictional representations of actual events which occurred in Toobworld. Among the shows that either had the characters talking about the movie, or watching it, or quoting from it are:
'Friends' - in three different episodes
'How I Met Your Mother'
'Law & Order: Special Victims Unit'
'Third Rock From The Sun'
As for Michael Rooker's appearance as Lt. Mauser in the story, this is no reflection on the character from the "Police Academy" movies - at least from within the reality of Toobworld. First off, if he had been the real character, as Al was, he should have looked like Art Metrano. Secondly, it doesn't even acknowledge the presence of those films, which do have a TV counterpart sharing the same dimension.
Instead, it's either the FULCRUM agent's real name, or he pulled it out of the air for an alias.
Thanks, 'Chuck'! Happy Holidays!