This episode's original title was going to be "The Groom, the Bride, and the Ugly."
Major Burns' helmet camouflage is non-regulation; it is, in fact, a textbook example of how not to do it (long, swaying branches sticking up significantly higher than their wearer) - another hint at the Major's incompetence as a soldier.
When Hawkeye and BJ are grilling Hot Lips about the good news, they guess about Frank's promotion...or Frank's demotion. As Frank Burns is a Major in the show, a demotion would've made him a Captain, a reference to the actual character of Captain Frank Burns in Richard Hooker's book, which the series is based on.