Monty Python & the SPAM Sketch

I have no idea how they pulled this sketch off, as the order of every word is so important. Were there cue cards? Did they actually nail memorizing it? I mean wtf?

THE MENU

Egg and bacon

Egg, sausage and bacon

Egg and Spam

Egg, bacon and Spam

Egg, bacon, sausage and Spam

Spam, bacon, sausage and Spam

Spam, egg, Spam, Spam, bacon and Spam

Spam, Spam, Spam, egg and Spam

Spam, sausage, Spam, Spam, Spam, bacon, Spam, tomato and Spam

Spam, Spam, Spam, Spam, Spam, Spam, baked beans, Spam, Spam, Spam and Spam 

Lobster Thermidor aux crevettes with a Mornay sauce, garnished with truffle pâté, brandy and a fried egg on top, and Spam.