Should have been the second episode to air as there are several references to Walter being in his first week. No desk yet (seen with desk in other episodes) and at the end of the episode James asks Walter how did he like his first week.
It is clear that this episode was originally supposed to be aired earlier in the season. For example, Dr. Talaikha shows Dr. Wallace a room that Dr. Talaikha had been using as an office and Dr. Wallace starts using it as an office as well. This exact room was shown in the previous episode already, with the two doctors using it as an office.