Watch Out for Lionels is the first half of the fourth episode in the first season of Stanley.
- David Landsberg as Dad
- Rene Mujica as Harry
- Ari Myers as Mom
- Shawn Pyfrom as Lionel
- Charles Shaughnessy as Dennis
- Jessica D. Stone as Stanley
- Hynden Walch as Elsie
- In one scene of this episode, we can see a fox barking at the armadillo. However, the fox would be the main plot in another Lionel-focused episode, Outfoxing Lionel.
- Mimi, Marci, and Lester aren't in this episode, due to time constraints.
- This is the first episode that Harry and Elsie go with Stanley to The Great Big Book of Everything, just like in Platypus Problems, Caterpillar Countdown and Koala Cuddle.
- Just like in Kangaroo Clean-Up, Lionel bullied Stanley in this episode.
- This is the first episode that Stanley went to the forest at night. The second one would be Whoo's Afraid of the Dark?.
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