Marshall owns an Apollo the Super Pup comic, seen in this episode.
The DirecTV description of this episode says, "Digger and Rocky help Ryder fill the pool with water." Digger obviously is Rubble; It's unknown why it says Digger instead of Rubble, though it may have been his original name.
In the scene where water begins to fill back up into the pool, Skye is seen without her pink vest. After a short scene of the water coming up from the drain, she is wearing her pink vest again. After Alex and his friends get into the pool a few seconds later, Skye can be seen without her vest once more.