When Cisco and Joe are examining the vault door after Melting Point burned through it Cisco says the door was 10 inches thick and required 6,000 degrees to burn through it. Yet none of the money, which was laying out in the open no more than a few feet from the vault door, show no sign of having been exposed to such high heat. The money should have been burned up, or at the very least been greatly singed.
In Iris's blog article titled: Welcome To The Streak Lives, PASSTIME (sic) is misspelled.
In Rogue Time (2015), Dr: Wells says that the heat gun achieves absolute hot temperature (i.e., the hottest any matter can get), yet when Cisco sees that a safe has been burned through, he says the heat gun could not have achieved that kind of temperature. Dr. Wells' plan requires Barry to succeed and improve his skills, so he would not lie about the heat gun, and even if he did, Cisco would have known.