When the witch sends her flying monkees to attack the heroes in the haunted forest, she says that she'll send a little bug along first that will take the fight out of them. This refers to the deleted Jitterbug sequence that was supposed to occur next.
spaceboy-it IS a slip-up, cuz what he is saying is that she still talks about the bug, like the scene is gonna happen, eventhough it didn't. get it now?
They deleted the jitterbug scene at the last minute because they thought that song was too "in" at the time and would ruin the mood of the movie. It would have delayed the movie release even longer (it had already been delayed several times) to shoot the monkey/witch part again, just to fix a few words like that.
It isn't a slip up. If you finished a movie and then decided to delete a scene, would you go back and check every little thing to make sure everything fit? I don't think so.
Look, (ahem) I own the special edition of the Wizard of Oz, and at the end of the movie it tells all the 'behind the scenes' features of the Wizard of Oz. There was no actual shot of the JitterBug scene, but there was audio recordings. In the JitterBug scene, Dorothy, the Tin Man, the ScareCrow, and the Lion dance with trees. I know it sounds weird, but that's what my special edition of the Wizard of Oz tells me. And this even gets better ! I said that there were no shots in the JitterBug scene in the behind the scenes part. Instead, they show home-movies made by crew and cast members of the movie put together as a collage, while playing the JitterBug scene music. I hope that this sums it all up for you guys.
If the producers felt it would date the movie, it was a good idea to delete it. However, having such a long period of time with no musical numbers changes the nature of the movie from a musical. When I watch it I feel like they just wanted to get it finished, so the ending doesn't have the same care and attention paid to it as the start, up to and including the song about the Merry Old Land of Oz.
I have the 50th anniversary edition of this movie, and at the end, they have a little "Making Of" feature, and it shows footage of the Jitterbug scene, and extended footage of the Scarecrow's dance in "If I Only Had A Brain", among other things.