If that column of material was 2,000 degrees Celsius, Caitlin and her mother would not have been able to stand as close to it as they were without getting burned.
No matter how cold Caitlin's ice is (and it can't be any colder than minus 273 degrees Celsius), instead of coating the 2,000 degree column it would immediately flash into steam, until the metal had stopped glowing yellow (and then red) hot.
When H.R. (Wells) gives Wally his latte, he tells him it has three shots of "expresso." The word is "espresso" not "expresso".
However this may not be a goof at all. H.R. Wells comes from Earth-19, a world with different terms than our own, so on Earth-19, "expresso" may in fact be the correct term. H.R. has specifically mentioned that "humans" are called "hominids" on Earth-19, and people commonly say "Until next communion" in place of "See you later".
However this may not be a goof at all. H.R. Wells comes from Earth-19, a world with different terms than our own, so on Earth-19, "expresso" may in fact be the correct term. H.R. has specifically mentioned that "humans" are called "hominids" on Earth-19, and people commonly say "Until next communion" in place of "See you later".