Plot hole: Liz first discovers Max's secret due to a science class experiment in which she sees his alien cells; yet later in the series, the four are told by Nesedo that they have human bodies.

Continuity: When Max, Michael, and Isabel are at the taco stand discussing Max's saving of Liz's life, you can see Michael hand Max the bottle of Tabasco the three are sharing, and when the shot switches, Michael again has the bottle of Tabasco.

Continuity: After the car gets pulled over and the sheriff says, "You kids be careful out there," Max shifts from looking at the sheriff to looking straight down between shots.

Plot hole: In the lab when Liz makes the slides of her cheek cells and the cells from Max's pencil, the first time she doesn't add stain and the second time she does. If she's going to be a molecular biologist she really ought to learn to apply techniques consistently.

Continuity: When Max heals Liz, he has his left hand on her stomach (pinky down, thumb up). But when we see the silver handprint, it is of a right hand (pinky up, thumb down).

Continuity: At the restaurant where Max, Michael and Isabel are talking, Max is sitting at the end of the table. Isabel walks up with her food and sits down right next to him. The tables have bench seats, so she can't just sit down - she would have to step high over the bench or sit on the other end and slide next to him.

Continuity: The sheriff gives his insurance information to Maria in the cafe and she holds it close to her chest. When he says "I can protect you" her hands skip to on top of the counter.

Continuity: In the UFO Center, Max extends the money to the mother twice.

Continuity: At the Crashdown, as Liz walks up to Max after the orthodontists look at her bite, Liz's order book skips from in her pocket to in front of her.

Continuity: In the scene where Michael and Maria were pulled over for speeding down the highway, Maria's seatbelt switches from being belted to not belted and back again. When it is seen from Michael's side of the car the belt is connected, but when it is seen from Maria's side of the car it is not.

Continuity: Near the beginning of the episode, Isabel walks into Max's room with a photograph. In one shot she switches it to her right hand. Cut back out and it's in her left again.

Continuity: In the cave, River Dog is holding the torch in his right hand, but as Liz walks away from him he is lit from his left.

Continuity: In Isabel's room, the Native American deputy turns to his right to leave the room. Isabel asks, "Which reservation?" and he's suddenly turned to his left.

Continuity: When Moss and Topolsky are talking in the alley after the hospital, Moss' arms on the door keep shifting. First he's leaning on the car with his palms, then he's leaning on his elbows with his arms crossed, and later they're crossed the other way.

Continuity: When Max and Liz are driving on the old highway in the beginning, a bunch of Liz's hair appears across her face between a wide shot and a closeup.

Continuity: In the shot where Amy DeLuca is talking to Geoff Parker, she's trying to sell him alien drink stirrers. As Jim Valenti's coming in the front door, she has nothing in her hair; but when she looks up to see him, suddenly the stirrers are in her hair.

Continuity: At the Crashdown, when Isabel says, "Fine, I'm not an alien," Alex's hands flit from on the table to gesturing in the air.

Continuity: When Max and Liz are talking about the basketball game in front of Max's locker, Max shuts his locker door twice.

Continuity: As Max and his mother are talking in the park she asks him about finding his real parents. She takes her hand off his shoulder and crosses her arms, but in the next shot her hand is back on his shoulder.

Continuity: When Max, Isabel, Liz and Maria meet up in the woods after they left the camp site to go to the crash site Max and Isabel walk off and leave Liz and Maria on their own. Max walks past a tree but when Liz and Maria catch up Max is standing next to the same tree waiting for them.