"Ellen Comes to Camp" was a sign of things to come with the Ellen character representing a change in all of Nickelodeon programing that was more "Mainstream" and "Corporate" with shows like "iCarly" "Drake and Josh" "Zoey 101" which those shows were heavily criticized by critics and adults who grew up as children in the 1990's.
This was actually the final episode filmed in the series while "Anawanna Inc" is the last official episode.
There's a deleted scene where the audience finally gets to see the Camp Anawanna office and the door of Dr. Kahn's office but the scene was taken out due to time constraints.
Dr. Kahn's niece Ellen was originally supposed to be a new character introduced in the third season per Nickelodeon's request but the series was cancelled when the cast and crew refused to move to Orlando and film in front of a live studio audience.
Samantha Jordan played Ellen in "Ellen Comes to Camp" and struggled to get much work after her appearance. She later found quite a successful career in the adult film industry under the name "Samantha Ryan".