my husband, on why crispin glover wasn't in back to the future II*

"He was busy breeding ravens."

Thankfully, the brilliant work of look-alike Jeffrey Weissman and the cunning use of already-shot footage allowed Crispin to pursue such ventures.

*We were watching Back to the Future II at his insistence. And, as it must always be said when Back to the Future II is referenced, "The Doc's aliiiive!!! He's in the Old West....but he's ALIIIVE!!!"