Continuity mistake: At the waterfall, after jumping off the cliff and into the water, Skye leads Josh to the rock carvings. Josh's wet hair keeps changing position from being completely slicked back, to partially covering his forehead, to being completely forward over his brow.
Continuity mistake: When the Sixers are in Terra Nova after the two Carnotaurus have been repelled, Mark Reynolds appears and disappears from beside Maddy during the shots of Maddy, Zoe and Elisabeth.
Continuity mistake: When Skye, Josh, and the other teens reach the waterfall, Skye says she's taking the shorter (and more dangerous) route. After the others have left to take the longer path, Skye strips down to her bikini, drops her outer clothes on the ground, then jumps off a 45-foot cliff into the water below, with Josh following her. When they meet up with the other teens shortly after, Skye is suddenly fully dressed again, even though her clothing was left atop the cliff, and her wet hair is now dry.
Plot hole: Skye's mother, Deborah, was held hostage by the Sixers for several years, though everyone believed she had died in an epidemic and was buried in Memorial Field. The Sixers kept her alive with medicine only they had to force Skye to act as their spy. Even though Terra Nova has a medical clinic staffed by doctors and nurses, it was never noticed that no one had witnessed Deborah dying, her body was never placed in the morgue, that was there no record of her being buried, or even questioned that there was no corpse. Deborah just disappeared without a trace and nobody wondered about it.
Factual error: Carnotaurus and Brachiosaurus didn't exist at the same time. (Brachiosaurus 157-145 million years ago and Carnotaurus 72-69 million years ago). The show talks about taking place 85 million years ago, and Carnotaurus lived in what's now South America. Brachiosaurus lived in North America and Africa.
Chosen answer: Because that's where the rift led. They don't have a time-travel machine, capable of taking them wherever they please - all they have is a hole in time leading to one single time period.
Tailkinker ★