"Seriously Maudie? The mad professor is obviously a boy, had you even seen the movie?"
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"The Case of the Extremely Empty Freezer" is the 8th episode of the second season of The InBESTigators, and the 28th episode overall.
Also, "The Case of the Suspect Sprinkler" was referenced again due to being an accidental crime, as Kyle put the cake accidentally on the freezer.
Ava mentions the Pilates app, which was mentioned by Ezra in "The Case of the Robot Robbery" when he saw Patrick's coveralls.
Ezra shows again his fear of dogs when Maudie suggests making a dog party, which he showed that for the first time in "The Case of the Puzzling Pet Day".
Kyle is again a suspect after "The Case of the Curious New Girl".