When Bugs enters the conference room at the beginning of the movie he says "Great nose job Chuck. Good rug Mel, never would have guessed" - references to Chuck Jones and Mel Blanc.
When Elmer Fudd is chasing Bugs and Daffy through the museum, the music playing is from the piano suite "Pictures at an Exhibition" by Modest Mussorgsky, a cycle of piano pieces describing a walk through an art gallery (by a man with a limp) and the different paintings he stops to look at.
When Elmer Fudd says 'say your prayers rabbit' Daffy has a hammer and nails, but when the scene cuts back to daffy afterwards, the hammer and nails have vanished.
While chasing through The Louvre Bugs, Daffy and Elmer jump into the painting "A Sunday on La Grande Jatte" which is on exhibit at The Art Institute of Chicago.