In a previous episode Ned stated that nobody ever steps on the wolf but in "Secrets" there is people stepping on the wolf.
When the people who own the cars come back to complain about the dirt being moved about by the boys, in the background one of the complainers is wearing a bright red wig but its a man wearing it not a woman.
"School Car Wash" takes place outside the school/school property. It is the second time it has happened but the first that an entire "episode" has been located outside of the property.
In the Car Wash episode, Ned's shirt changes from wet to dry many times.
Cookie and Ned: Aw, Moze!
Moze: Wow, you guys look like just have seen a ghost, is everything cool?
Cookie and Ned: No, no!
Cookie: We saw Loomer- (Loomer appears behind Moze)
Ned: Yeah, yeah! And he was-
Cookie: Wearing his- (deep voice) Black jacket!
Ned: Come on! You´re not going to throw in the towel, are you?
(everybody throws their towels on Ned)
Seth: (trying to read a book, trying hard making a big effort)
Moze: It´s everything ok?
Seth: Oh yeah, I just like to make weird faces to the books before I read them.
Moze: How did they clean so many cars so fast?
Crubbs: Because they didn't! They didn't clean the dirt, they just rearanged it!
Crony: I am in the -
(Bell rings, nobody hears what he says next)
Seth: Basketball is the most important thing in my life. Then busting rhymes. Then cartoons. Then corn!
Ned: Let's get washing!
(Loomer dumps bucket water on Ned's head)
Ned: The cars, I meant the cars!
Loomer: Well, I have a secret too. The truth is,I never liked either of you. I'm still in love with Jennifer, and one day,I will steal her from Seth.
Moze: I kind of wish you would have kept that a secret.
Apparently Loomer and Suzie got back together again after they broke up in "Valentine's Day", however they break up again.
Cookie discovers Crony's secret about being in the sewing club and convinces him to tell Loomer.
Loomer reveals he is afraid of ghosts.
Seth reveals to Moze that he can not read or write well.
Sometimes revealing your secret can make you feel better.
Tip # 381.WCDEC
A wet car does not equal a clean car.
Seth does not have a basketball in this episode.
Bully Loomer does not wear his leather jacket in this episode.
Tip # 525.H2O
Keep dates flexible and watch the weather.
Tip # 672.TFC
Have your school carwash where there's lots of traffic.
Tip # 606.7CW
Always bring a spare set of clothes.
The end of Secrets features a chase medley similar to a Scooby Doo episode.
Suzie finds out that Loomer was seeing someone else by dressing up in a costume and spying on him.
Suzie and Loomer break up again in this episode.
Running Gag in "Secrets": Crony saying, "I'm in the-" but gets interrupted by the bell.
Running Gag in "Car Wash": Loomer dumping water over Ned.
In Car Wash, the music used when they are washing the cars seems to be a play on the song "Car Wash" by Rose Royce.
(after getting chased by Loomer, Ned and Cookie ran to Moze.)
Moze: You guys look like you've seen a ghost, is everything cool?
Moze said that to Ned and Cookie in a similar way Captain James T. Kirk told Captain Spock in Star Trek V: The Final Frontier.
After Ned and Cookie try to do the Ghost Illusion/Hologram in Loomer's locker, there is a running-away music sequence. This is in reference to the Monkees TV show which did that in almost every episode.
Seth: ....then Busta Rhymes....
He is referring to rap artist, Busta Rhymes.
The show Scooby Doo is alluded to in this episode. Making reference by saying "I would have gotten away with it if it wasn't for you meddling kids" and when Lisa Zemo loses her glasses, she is dressed the same and says the same thing as Velma Dinkley from Scooby Doo. They also have a scene with the main-hallway-going-in-and-out-of-doors scene when Loomer is chasing Ned and Cookie