Once Again
Once again the show does zero research on their topic. As a mom whose kid has had head lice here's how far off they are:
Not everyone in the house will get it. When my daughter had it, neither myself nor my husband did. Nor did the mom of her best friend who also had it.
Dogs and cats do not get lice. There was no reason to shampoo the dog. A physician would be well aware of this.
You comb (literally, nitpick) after you've killed the lice, not before. You also have to continue to comb and check for two weeks.
One shampoo treatment will not kill all the lice. You will have to either repeat the procedure a couple of times OR use the natural (but ultimately more effective) olive oil treatment every other night (or maybe every third night) for a month
Since Jackie had just been to the hairdresser's, she'd already know if she had lice. They would've told her while doing her Brazilian blowout.
All of this is information readily available online and reason #9999 that I continue to hate this show. But will drop by for the odd 10 minutes to hate watch.