ask!
How forced was the Darth Vader cameo?
To say the least... he bumps into Solo during the imperial recruitment scene, looks at his blaster and mumbles "I'd catch that easily"
I heard Han retorts by saying “I would send you catapaulting into space if we were ever in an aerial battle.”
omg, that was lame...
Are there any tie-ins with the Holiday Special?
Actually yes. Woody Harrelson reenacts the entire StirWhip routine from the Special. It's hilarious.