In the opening credits Diana Agron's name is incorrectly spelt Argon.
When Takezo Kensei steps over the unconscious Hiro, you can see a modern rubber sole on the bottom of Kensei's footwear.
At the tryouts, Debbie mispronounces the word "extraordinary" as two words rather than one (ex-TROR-dinary). This basically means very ordinary instead of super special. Claire makes the same mistake at lunch with West.