Doogie was Born on the 21st September 1973
Goof in opening credits: The second newspaper article shown says that Doogie graduated from high school at the age of 12 years old (after being in high school for 9 weeks). The third newspaper article shown says that he graduated from Princeton at the age of 10. So he graduated from college before graduating from high school?
Continuity error: When Doogie's dad says "I have never been more disappointed in you than I am now." You can see Doogie in the back seat in the background looking straight at his father with no movement. A quick cut close-up on him shows him looking to his right then straight at his dad with no time to move his head.
Doogie knows Japanese, which he learned from the gardener.
At the age of four, Doogie's Mother realized he was able to learn languages very quickly when she took him to her Spanish class and by the end of the first week, he was helping her with her homework.
We discover Doogie had cancer and that Vinnie shaved his own hair when Doogie's fell out.
This episode shows the first time Doogie shows his journal to anyone. He actually writes the entry while Wanda is watching.
In the Christmas carol that the staff was singing, they "received":
7 Giant Colons
6 Small Intestines
5 Prolapsed Hemorrhoids
4 Gastric Ulcers
3 Yellow Gallstones
2 Fatty Livers
And an asthmatic in the E.R.
In this episode Doogie renamed his journal from the "Personal Journal of Doogie Howser, M.D." to the "Personal Journal of Dr. Doogenstein."
In season one's episode, "Doogie's Awesome, Excellent Adventure," Doogie pierces his left ear. However, this episode shows him with no earring, but also with no scar or hole from it either.
Dr. Canfield introduces Doogie as an attending physician to Mrs. Bea Portmeyer, instead of as a resident.
While playing Scrabble, Doogie comments that Vinnie played SCREWED on a triple word score. While the word does appear on the board as shown, it is played in the middle of board, nowhere near the eight triple word score spots around the edge of the board.
Doogie's home mailing address is:
1782 A Amalfi Drive
Pacific Palisades, CA 90272
Wanda's mailing address is:
3320 East Ontario Avenue
Rm # 418
Chicago, IL 60603
This episode "completes" in the episode "Doogiesomething" (season 3, episode 10), when Doogie tells Wanda about his aborted attempt to come to Chicago for her birthday. We finally get to hear what happened after the episode ended.
The time allowed by the writers for Doogie and Vinnie to arrive in Chicago the next day at 8 AM is not realistic. Chicago and Pacific Palisades, CA (from Lonesome Doog episode) are 2,152 mile using I-40E and 2,037 miles using I-80E. At legal speed limits the time necessary to travel the distance is 1 day 8 hours to 1 day 10 hours. The story takes place the day before Wanda's birthday, which is when Doogie wants to arrive. Even without the car troubles, Doogie couldn't arrive at the stated time in the episode.
This episode "completes" the Doogstruck episode (season 3, episode 8) where Doogie attempted to reach Chicago to see Wanda on her birthday. We find out what happened after the episode ended.
Vinnie discovers Doogie's journal has been keeping a journal and wonders if Doogie's blackest day really was when his parakeet died.
In 2003, Neil Patrick Harris provided the voice of Peter Parker/Spider-Man on the shortlived Spider-Man The New Animated Seriesand The Amazing Spider-Man in the 2009 video game Spider-Man: Shattered Dimensions.
The diary entry:
January 31, 1991... This year, out annual father-son vacation included an extra son. Vinnie climbed a long way with my father -- to take a small step with him.
differs from the original entry (as seen in season 2, episode 18, "My Two Dads," which aired on February 6, 1991). This entry has a different date, uses different pronouns, and punctuation. The original diary entry reads:
FEBRUARY 11, 1991... This year, out annual father-son vacation included an extra ''son''. Vinnie climbed a long way with my father -- to take a small step with his.
The diary entry
March 17, 1986... It's a hollow victory that comes at someone else's expense. If I'd won, I still would've lost.
is different than the original diary entry. There are three differences. First the date "March 17, 1986" does not agree with the original entry, which has a date of "April 14, 1990." Second, the punctuation and spacing are different. Finally, this new entry has a different ending sentence.
The original entry is from the season 1, episode 23 episode titled "And the Winner is..." aired on March 28, 1990. It reads:
APRIL 14, 1990... It's a hollow victory that comes at someone else's expense... I wish I'd understood that a week ago.