If any of the video is in sync with the sound it is completely accidental, although the original intention was for it to be so, but that fits with the general amateur nature of the project.
Opportunities to fiddle with the music and video software recently haven't been as many as I'd have liked. Having said that though it has been a useful experience, I am becoming more familiar with the software, getting a feel for where the sticking points are, and when to be patient.
Other things to remember are:
Use a metronome/click track - I gave up trying to synchronise after the fact.
Storyboard the idea.
Use lots of short video clips.
The built in effects are decent but quickly become clichéd.
Resolve green screen background issues before filming.
Get some interesting content.
Keep it simple.
Make sure it has humour.
Keep film of your own face to a minimum - next time...
How hard must film production and editing have been before the advent of digital, even with digital it's a lot of work, and to produce something of high quality must require huge effort and patience.
Song Credit: Eric Idle
Image Credit: NASA - for all the photographs used in the video.