Gravity assist: It's easier to just drop the transmitter & cord down their shirt from the top than to push it up through their clothes.
A great little film that started out as a student film with lot of heart and grew into a really fun ride that helped to launch some big names.
One common mistake is shooting a talking head or other scene with dialog on an indoor screen then keying an outdoor scene behind it. The voice / audio is NEVER believable. Whenever possible, watch for a time that the natural light outdoors matches the footage being keyed in and carry the screen and camera outdoors and you'll produce 'matching' or much more believable footage and audio.
I once had a local TV station ask me how I was able to pull such believable keys for an outdoor background and I replied - carry your screen outdoors. The audio including voice and room-tone will be believable because the talent WAS outdoors. On days when you can use the sun to light the screen and the talent, it feels even more real. The next week, they painted the back wall of their patio chromakey green and they use it regularly. If you are shooting a fantasy film, then studio fake lighting probably works okay but to get outdoor realism, shoot outdoors. Medium to light overcast is a natural silk.
Years ago, I was alone and bored one weekend, so I made this: https://www.youtube.com/watch?v=P4ygENN9MtA
You need to be able to do most of the post in your head while you're shooting.
I didn't put a credit roll on this, first, because its unfinished but mostly because it seems silly to roll one name.
I'll do this again one day - with a complete script - now that I'm a lot better at editing.
I promise to surround myself with the best people so that I can talk less and listen more. I'll keep in mind that some of the very best scenes were re-written on-set by the cast & crew because they often have a lateral view and actually know and feel stuff that I don't.