When Maggie breaks into the office on the doll string with the bottles as weights, the bottles are shown with strings around them, tying them to Maggie. When she lets go, she is pulled straight back up with no strings attaching her to the bottles.
In response to Marge staying in character as Blanche DuBois in order to rehearse, Bart also "goes into character" by adopting a Cockney (East London) accent and vocabulary. But "gulliver" which Bart uses for "head" is not authentic Cockney (the correct word is "loaf") but Nadsat, the fictional argot invented by Anthony Burgess for his novel "A Clockwork Orange". This probably shows Bart's ignorance of the culture he's trying to ape.