Jumping Jiminy

The show: The Big Bang Theory
The episode: "The Jiminy Conjecture," first aired September of last year and reran this past Monday.
What happened: While eating dinner in Sheldon's apartment, Sheldon, Howard and Raj hear a chirping cricket, which Sheldon immediately identifies as a snowy tree cricket. Howard is convinced that it's a common field cricket that they're hearing. Sheldon and Howard wager special items in their respective comic book collections and proceed to trap the cricket. However, visual inspection of the specimen fails to resolve the issue. They take the cricket to Prof. Crawley (Lewis Black), the university's appropriately named bug expert. Unbeknownst to the three friends, the university funding to Crawley's lab has been cut and now the old professor is more interested in venting about his personal and professional frustrations than in identifying the cricket that has been brought in. Crawley snaps that the specimen is just a common field cricket. Dejected, Sheldon goes to the bank to retrieve the comic book he put up for the wager from his safe deposit box.
Meanwhile, Leonard and Penny deal with their lackluster sexual encounter. Penny actually takes Sheldon's advice in the matter.
What doesn't quite make sense: Given how obnoxious Sheldon is about always being right (amply demonstrated in the episode's first scene, in which Sheldon proves Wolverine once had retractable bone claws), I think he gives up rather easily at Crawley's identification. For one thing, the cricket did not chirp at all while in Crawley's lab, and an earlier scene suggests that visual inspection is insufficient to distinguish the snowy tree cricket from the common field cricket (whether or not that's the case in real life I don't care to find out). Sheldon doesn't bring this up. Nor does he protest that Crawley is way too emotionally distraught to be able to render his expertise with the necessary due consideration.
Granted that there's little time left in the half hour episode to allow Sheldon to fully cross-examine Crawley, much less find another bug expert to bug about the cricket, but the nit could have been avoided altogether by just putting in some chirps into that scene and having Crawley say something to the effect of "Those chirps don't fit Dauber's correlation." (Sheldon mentioned Dauber's correlation earlier in the episode, so no time would be needed to explain it again, and if time is short, Raj's unfunny parting remark to Crawley could have been deleted with no problem whatsoever).