Halloween at Dunder Mifflin is always fun, because the characters are wacky and creative in their own right. With the added incentive of "$15,000," everyone buckles down and tries even harder to come up with a great costume for the contest which fills most of the episode.
The only part that detracts from the episode is Michael. All the ragging of Darryl got unfunny and tiresome, especially when it spread over to other characters. It's his last season, and if his behavior was always on the "Costume Contest" level, I'd be glad he's going. For once, Michael should just be in the background instead of making a big deal out of nothing and coming off looking mean. Michael's cluelessness can be innocuously fun, but this definitely was not the case.
We finally learn that Danny didn't call Pam back... because she's a dork. Well, the audience is perfectly fine with the way she is and Jim is too, coming back in the Popeye costume.
Score: 8.8/10