I do quite a few theater assignments...they are super easy. I enjoy them because they are super easy, and the report takes less than five minutes.
For trailer checks, you make a list of the trailers shown before a particular movie. Sometimes, there you might have to look for a specific version, and note if the audience reaction was positive, negative, or neutral. You do this for every copy the theater has of that particular movie. Sometimes, with new releases, it specifically has to be the first showing of the day, and the reports have to be submitted within the hour. I've done a few where I had to count how many seats were in the theater.
Materials checks/lobby checks are also easy. You just have to walk around the lobby looking for specific items. It might be a specific style of bag for the popcorn, or a certain poster, etc. Usually those require you to take a photo.
Sight and Sound checks might be the easiest of all. Literally just walk in and watch the screen for 10 minutes, and check the picture and sound quality are acceptable.
I did have one assignment that was a pain...it was a covert ad check where I had to go in half an hour before the movie and make a list of every ad shown, the time it was shown and how many seconds long it ran. Plus list the seating capacity, and count the audience members. But, it had a nice bonus, and I was reimbursed for the two movie tickets.