The plot point of Timmy's pets always dying from neglect is reminiscent of the episode, "That's Life". The main difference is that in the first episode, Mr. Turner is the reason that Timmy's pets always die.
This episode implies that Vicky might be taking out her frustrations on Timmy.
Johnny Test - In Sparky's clip, there's a scene where he and Timmy were like superheroes, making a reference to Johnny X and Super Dukey.
The introduction of Sparky creates a few continuity errors on the series. See Sparky.
When Sparky buried the house while Timmy was asleep, Timmy wishes it back up and Cosmo, Wanda, and Poof can be seen with their wands in this scene. However, in the later scene where the magic fleas are biting people and Timmy wishes them back to normal, Wanda mentions that they can't because Sparky buried the wands, but they just had their wands and granted a wish earlier when Sparky had already buried things.
Chet Ubetcha says that Timmy is the worst pet owner of the world even though Mr. Turner made all of Timmy's pets die.
Chet Ubetcha looked through Timmy's window when his fairies were floating, but there was no indication that the fairies disappeared due to his presence.
Sparky said that he can speak because he just ate a dictionary, but in Let Sleeper Dogs Lie, we can see that Sparky being able to talk even before he ate the dictionary.
Timmy says he is the only person in Dimmsdale without a pet, when he has had pet goldfish for the whole series.
Jorgen cannot have a niece because in the episode, The Gland Plan he says "I have to find the Anti-Jorgen" when his Fagiggly Gland was acting up, which means he doesn't have a sibling because Fairies can only have the transplant with siblings or anti- counterparts. A similar error occurs with Cosmo in Double-Oh Schnozmo!.
When Sparky shows Timmy his photo album, his previous owners clearly aren't fairies, and they can't have fairy godparents because they are not kids. Therefore Sparky is revealing the existence of fairies. Also Sparky said that his previous owners dropped him off at the store. This means his owners had gone to fairy world to pick up and drop off Sparky.
When Mr. Turner's rock knocks Timmy off his scooter and through the window, there's a full moon out and it's also dark out. But when Mr. Turner notices the moon, it's daylight again.
After Chet tells everyone that the dam is bursting, it zooms down to a street near the dam where his car's being towed. But when Wanda says that Timmy's house is the first house it's going to hit, there's no road. It's unknown if the road is behind the fence in Timmy's yard.