In the prequels and CW Series we see R2 use his rockets which we didnt at all in the originals. Could R2 use his rockets to get into the X-Wing when Luke is on Dagobah when Luke leaves to help Leia and Han? As we saw on ANH, it seemed liked a big production to get the droids in the ship. But then in ESB there isnt anyway for him to get in.
I know this was breifly covered a few pages back but I though showing R2 boosting his way into the X-Wing and/or boosting his way out on Cloud City.