One of the quotes is given as follows:
Major Albert Rayne: [ogling Lily as she walks away] Why does she walk like that?
Nanette Parry: [aside] Can't think.
What I understood Nanette Parry to say was, "Cockney." I think that's a lot funnier.
Am I right?
I'm pretty sure it's "Can't think". If she had replied "Cockney" it really doesn't mean much than a dig at her being working class. It pretty much just stops the line there.
But to reply "Can't think" is arguably funnier - and racier - because it invites the viewer to try and answer the question and imagine why she walks that way. Is it that she's so well endowed? Maybe flirting? Maybe, ahem, some other reason? Only the viewer knows what he or she is imagining...