As Mark is dipping his finger into the cookie batter bowl, Lucas walks in and immediately dips the middle finger of his right hand into the bowl. The next shot shows him licking the index finger of his left hand. He then dips the index finger of his left hand in but the camera cuts and shows him licking the middle finger of his left hand.
Did Fallon is sitting down for a shave. He then changes his mind, stands up and wipes off the shaving cream. His face is already clean shaven.
As Julia slaps Lucas and while she is wearing the same outfit, it is apparent she is wearing a modern (circa 1950's) bra under her blouse.
After the altercation at the dinner table Lucas is talking with Julia and says "Don't you worry Ana",