Revealing mistake: At the end of the episode when Tuco shows up at Walter's house in the backseat of Jesse's car, he tells Walter to get in. As they drive off, the shot pans out to show the street sign across from Walter's house. The sign says Piermont, which is the real name of the street. In the show, the Whites live on Negra Arroyo Lane. (00:48:00)
Continuity mistake: Charlie, Olivia's former partner and friend in the FBI shows up in this episode during the interview with Mrs. Rusk, but Charlie was killed off by one of the shapeshifters in a previous episode, and the shapeshifter that killed Charlie was himself killed off by Olivia, who in other episodes reflected back on killing him. This episode was supposedly meant to be in season 1 as ep 21 or 22. Unknown why they didn't air it then, and decided to put it in the middle of season 2 (for no apparent reason).
Continuity mistake: When Jax and his crew meet up with a Hispanic gang to sell them guns and are outnumbered, they run in the station wagon. The run the station wagon through a gate and roll it, destroying the front end, but magically the station wagon's front end appears with little damage afterwards. (00:27:15)
Factual error: Enid, the telegraph operator, exclaims that "He is sending an SOS." However, in the 19th century, distress calls did not include the letters "SOS," It was not until the early 20th Century that SOS was chosen as the international distress call.
Other mistake: The battle droids - including the commando droids featured here - habitually have two broad fingers and a thumb. So how can a commando droid squeeze itself completely into clone trooper armor without its broad fingers tearing open the gloves, since it can't separate its fingers?
Continuity mistake: All shots of the Jeep Cherokee prior to it crashing (and during the process of flipping over) show that it wears factory-optional silver steel wheels of a 'star' style. But as the wreck settles upside-down, it's wearing plain steel wheels (like those found under full wheel covers or on a spare tire).
Continuity mistake: Moseby shows a 'Mood Hanky' to London, and it turns purple when London embarrasses him. When the other characters reveal their inventions, 'Granny Smith' and the robot feed Moseby a sandwich. Moseby enjoys the sandwich, saying "Mmmmmmm! Cheesy!" Even though he is happy, the Pocket Hanky is still purple.
Factual error: This series uses a beautifully-rendered CGI sequence of New Amsterdam C. 1650 morphing into New York City of the present day. The Native American tribe we see at the start of the sequence, however, never inhabited the New England area. They look more like the Lakota plains tribes seen in Dances With Wolves. The North-Eastern tribes didn't build teepees as seen here, either. The dwellings should be longhouse wigwams made of wood.
Factual error: The camera starts out-of-focus looking down a crowded sidewalk full of background actors in period clothes and hairstyles (1973). As the camera racks into focus, Sam is walking toward the camera with many awnings visible in the background - a large blue one reads "24 Hr ATM". Though versions were invented prior to 1973, they didn't come into wide usage until the mid-to-late-80's and certainly weren't available in East Village bodegas at the time of this episode.
Continuity mistake: During "Brand New Day", at one point, Dr. Horrible stabs a picture of Captain Hammer attached to a dartboard with a handful of darts, all right in the center of the picture. A few shots later as Dr. Horrible sits, suddenly the darts are far-more spread out. (It's in the background and can be hard to see, but it's noticeable.)
Plot hole: Parker gains access to the external room using a valid security card, they figure out the CEO's passcode which opens the burn room door...and yet the room inside is still protected by a swarm of lasers. Was the CEO supposed to dance through the laser sensors like Parker does every time he goes in?
Continuity mistake: After the opening title sequence, it shows Batman and a reporter tied to a giant bullseye target. She and Batman are equal distance from the center bullseye, and it is about waist level on her. It then cuts to a perspective from Batman's angle, and suddenly the reporter is much closer to the center, and the bullseye is level with her calves. Then when the giant pie is flying towards them, the center bullseye is level with her and Batman's feet. (00:05:05)