I think it's very bullshit-able. Just do it with class, and big words.
I managed to pull it off. Don't make it too simple, like say you were doing Postmodernism for Ext 1, don't say "it links to Ext 1 because my majorwork is postmodern". Try and make sure it sounds like you ARE doing a bit extra.
But yes, very bullshit-able. But it IS important, it's one of the dot points lol.
EDIT: Better not give the wrong message.... really really really try to extend from what you learn, even if it's a small brush over in English. It doesn't matter if it really sprouted from English Adv/Ext 1 or not, as long as it seems influential etc.