Quest for Camelot/WMG

Rubur Serves the Cause of the Chaos Gods from Warhammer.
One could easily make this connection by looking at how his "Mechanical Army" is created---shades of Khorne.

Kayley is an ancestor of Belle.
Belle could almost pass as Kayley's identical descendant. Seriously, look at their faces and not think Strong Family Resemblance. As for why Belle is in France, one of Kayley's descentdants before Belle moved to France for whatever reason.

The Knights of the Round Table are communist warlords.
"Each of us will now divide, in equal shares our countryside."

Ruber has a plan.
It includes you.

"Quest for Camelot" is the sequel to "Monty Python and the Holy Grail."
Look at the two King Arthurs. The king who Kaylee is fighting for looks quite a bit like Grahm Chapman, doesn't he? And Merline doesn't look unlike Tim the Enchanter. Thnk about it. The singing at Camelot. The insanity of the whole movie. Ruber's helmet even resembles that of the Knights Who Say Ni. The swamp that Kaylee meets Garrot in is the "bloody swamp" that the Swamp Castle was build over (it sank again).
 * Oh god! it all makes sense now!

The bad guys locked up Bladebeak's wife for a reason
She's a chicken, they're a bunch of hedonistic gluttonous bad guys, and they're about to go somewhere that involves large banquets and giant tables. Don't get it? They were going to cook and eat her to celebrate their victory. Bladebeak found out and this became the straw that broke the camel's back.

The entire "If I Didn't Have You"-sequence was all in Garrett's head
C'mon. It's hard to believe Kaylee wouldn't pay attention to all the flashy stuff going on, or at least lampshade it afterwards. In reality, Devon and Cornwall was just singing the song itself, acting it out. All those flashy things and the mysterious background-music appearing was just in Garret's head. His imagination sprung loose and so, the scene happened such as we saw it. It also explains why he didn't want any more songs. Being used to see the world as a person living in medival times, all those flashy, crazy things going on was too much for him. He didn't want the imagination to leap amouk again.