When Marshall et al are on the boat, Robin throws the cell phone overboard. When the scene cuts back to Ted, he can still hear them laughing through the phone.
When we first see Robin in the stormtrooper armor her hair is clearly hanging down the back. Shortly after, when she laughs at Ted, there is no hair.
Robin says that she never threw anything out for any relationship ever. However she did get rid of her dogs when she was dating Ted.
When Robin enters the apartment as 'Rhiannon' in Ted's flashback/forward, she plays a bass solo but her fingers are clearly not moving.
Han Solo never says punch it chewie closest he comes is OK punch it.