These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fridge Brilliance: Why did Watcher fall for Katie? Well sure, she's cute, smart, and all these things. But remember else what both of them have in common. They wanted to be accepted (more or less). Watcher wants to be normal and have a family/be loved. Katie was a social awkward virgin looking for love as well. He sees in her as sort of fellow outcast.
Then in the season one finale, they take the elevator when they know they bad guys know where they are and are actively watching.
In the introduction for the shapeshifter character, why didn't Jim just ask "Steph" to use her super speed?
When Watcher terrorizes Daphne before wiping her memory of the past three months and all of the experiences and bonding the family has had in that time. It's very reminiscent of a rape scene, which is fitting
In the same episode, Watcher telekinetically forces Dr. Chiles to commit suicide. Made even worse by Daphne's vision of Watcher's memory of the attack.
They Wasted a Perfectly Good Plot: Other than hiding the Watcher's secret, Daphne's memory loss has no impact on the story, immediately being caught up to speed by absorbing the memories of the others.
But that not only conveniently covers the memories of the Watcher's secret, it also sets a precedent for future uses of this plot which will help avoid having it feel like an ass-pull.