Dd11 subject accelerated in language arts in 3rd grade and grade skipped from 4th to 6th. When she was going to the 4th grade LA class in 3rd, the only gap she had was that she didn't learn cursive since it is taught in 3rd. I just taught her cursive at home. I can't say that there were any other gaps in that subject which included spelling, reading, and writing.
As far as when she skipped 5th, it is probably older than you are looking at, but she didn't really have any gaps in any of the subjects except for a few math concepts she hadn't been taught. It was minor, though, in that she maintained an A in an accelerated math class all year and was still advanced on her math CSAPs (NCLB test in Colorado).
