- Alex makes his first episode appearance.
- It is said that Katie has a grandmother, but it is unknown which one of Katie's parents' side of the family she is on.
- This is the first time a pup is only seen with a uniform and headgear without his/her pup pack.
- During some airings of this episode along with "Pups and the Kitty-Tastrophe", this episode has no title card.
- Near the end of the episode, Katie is seen to throw treats to the pups; the first handful includes a red treat, but it doesn't land with any of the pups.
- A steam whistle sound effect was used on the locomotive despite the the locomotive actually having a horn. This was repeated in other episodes the train appeared in. 
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