OK, as a big fan, I had to see this movie asap. The first thing I was exited to see was what the Weasley twins did to Dudley, but nope, cut out. Then the whole world cup and the Veelas, nope, cut out. Then I thought, they'll have to get it right soon, ha, no flying muggles.
Some thing that I noticed is that Dobby and Bagman were missing. Along with Dobby, SPEW/the house-elf liberation front was missing. Neville was able to dance, and the Cho-Harry-Cedric triangle was all thrown off. Everything, including Dumbledore's emotion, was thrown out of proportion.
Before you judge, or go on, note that I do realize the effort and problems with a book this size.
Anyway. Some of these things were taken out because they were needed to be: Crouch Junior attacked dear old papa, the little joke behind McGonagall putting her hair down, Moody's grand entrance, the mermaid picture helping, Skeeter's "ability", many obstacles on the third task, Harry and the Weasley's in a box with the ministers, and why Krum went all crazy on the third task.