Why did the gingerbread man go to the doctor?

He was feeling crumby

Why did the elves implement an "open door" policy at Santa's workshop?

They wanted to encourage more elf-expression.

Why was the Christmas tree in a good mood?

Because it was branching out and having a tree-mendous holiday season

Why did Santa hire a quality control expert for his Naughty or Nice list?

He wanted to ensure there were no claus for concern.