The Rugrats attend a midieval fair where Stu has created a mechanical dragon that takes part in one of the shows. When the invention goes out of control, who can stop it? Only Reptar can! - Description from Klasky Csupo
Stu and Didi take the kids to visit a local "Renaissance Fair" at the park, where Stu tests his new prototype dragon.
In the beginning of the episode, when the babies are in the car, Lil is missing her bow in one scene.
At the end, we see Reptar leaving in his truck. As he gets in he accidentally slams his tail in the car door, so part of his tail is sticking out of the door. He then drives away. However, in the following the scene, the tail is no longer sticking out.
At the end of the episode, when Didi is standing with her hands on her waist, one of her hands are backwards.