OK I'll try to explain objectively why I didn't enjoy this episode so much:
Spoiler Below
1. Honestly, it was too predictable. After the first prank "backfires," it was obvious what was going to happen. While I didn't anticipate Mr. Herriman answering Room 212's door, I knew right away it was a fake. I was thinking it was a cardboard cutout of Mr. H, so points for throwing the two new IFs in a Herry costume instead.
2. It lacked the Foster's touch. Replace Bloo with "Sylvester", Coco/Ed/Wilt with "Tweety", Herry with "Grandma", and take out the Foster's Bus, and you have pretty much an acceptable Looney Tunes plotline. Coco even only used her eggs once, from what I remember. And since when does Bloo carry $200+ in his pockets to pay for 80 pizzas?!
3. It's only fair that Bloo gets the short end of the stick every now and then, but the new IFs really weren't too funny. I kinda felt bad for them being all tied up.
4. Fortunately, there was a good ending. The best part of the episode was easily the last 30 seconds or so. The whoopie bag and Sly Wilt, I wasn't expecting at all.