- What does the seat-back entertainment consist of?

As I recall two chanels of current "first run" movies, One chanel of older movies, discovery chanel, sit coms. They are run in blocks and repeated throughout the flight. If you fly back the same month you get exactly the same stuff on the way back. BusinessFirst gets move selection.

Can you watch a couple of channels, or are you stuck with what they decide to show, when they decide to show it.

Yes you can switch around, but each channel shows two movies so you will have to wait for the right time to see the second one.

Can you pull up the in-flight route map even if there is a program being shown?
Can't remember.

- When are the meals served and how many are there?
Shortly after take-off and before landing + a snack in the middle.