"Who Let the Moths In?" is the first segment of the 2nd Season 4 episode of PJ Masks.
The moths infiltrate HQ, and Gekko won't admit that he let them in until it is too late.
- The episode's title might be a reference to the song, "Who Let the Dogs Out!".
- Luna Girl introduces her Moon Whistle in this episode, which she uses for the first time.
- This episode, along with "PJ Sky Pirates" and "Big Sister Motsuki", is one of the post-"The Prank Wheelz" episodes to have Romeo's Lab.
- Motsuki is the third villain to ring the PJ Masks’ HQ’s doorbell.
- The first villain was Luna Girl in "Moonbreaker", and the second villain was Romeo in “Invisible Owlette”.
- In this episode, Teacher states that the Kuiper belt is at the edge of our galaxy, whereas it is actually at the edge of our solar system.
- The episode's storyline shows some similarity to "Gekko's Stay-at-Home Sneezes".
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