I agree, DR ChasSmith - DR Jrand72's list was quite comprehensive, and there is just so much to like.
The pre-audition and audition scenes were hilarious.
A wonderful Easter Egg of a surprise was the off-camera voice of Grandpa.
All the elements blend so beautifully together, down to the smallest music cue.
I want to go back to the pie scene to try to figure out if the sound effects were enhanced or natural. Either way, hilarious.