 In the extended edition, the nature of Bilbos party plan is very different.  In the original, the film made it seem like Gandalf was in on the joke and  was keeping mum about it with Frodo, keeping the happy air of the Shire  scenes. However, in the Extended Edition, further close ups and different  dialogue takes show that Gandalf not only is unaware of the trick but  actually is concerned about it.