As a lesser known fact, the second parameter in "WAIT 6502,1" works as a multiplier. So, "WAIT 6502,2" will print the message twice, with 3 it will print trice, and so on. Even 0 works, filling the entire screen.

Dave Pl has a video on this which talks about easter eggs in Lunar Lander and make amongst other things

https://www.youtube.com/watch?v=HsNbH_ohKxA