Slice the bananas into thin slices and then toss with the lemon juice. The lemon juice will prevent them from turning brown as fast as they normally would.
Prepare the filling. Whisk together the 1 1/2 C milk and pudding mix. Mix in half of the cool whip. Mix in 1 C of the vanilla wafers and then the bananas. Scrape into the cooled crust. Refrigerate for 10-15 minutes or until set.
