Over the years I've come up with a couple of things that really work when teaching recorder; as well as a few that completely flopped! :) I've recently started working on Low E with my 4th graders and something I find them repeating to each other are my directions on how to remember the fingering for this pitch.
When we learn it, I describe the fingering as G plus bunny ears. I've tried G plus two and a number of other ideas but bunny ears seems to stick.
(And a sneak peek at the backdrop for our concert!)
Add bunny ears for low E. We still have a bit of work to do on finger position but what you really want to avoid is below...
Some students will tend to tuck their fingers back behind the recorder or curl them up. This makes it harder for them to change pitches later on.
Just thought I'd share this little recorder tidbit. What are some of the recorder tricks you use with your kids?