Taryn said that Ethan was eight and a half years old and was born in October. Carina said that Mason was nine years old and was born on Christmas Eve (which is December 24th). Even with some generous rounding on the part of the mothers of their kids' ages, Ethan should be a couple of months older than Mason, not half a year younger.
During one of the surgeries, Dr. Browne mentions an accident that took place on "the 280" freeway. The placement of the definite article "the" in front of freeway names is a practice common to those who live in Southern California. Northern Californians do not use the word "the" in front of freeway names and since this show takes place in San Jose, CA Dr. Browne should have said there was an accident "on 280".