I believe Applegate was originally going to have Rachel's mom remarry instead of Marco's dad, but changed her mind. In Megamorphs 2, Rachel mentions to Tobias that her mom is planning to remarry. This is because Tobias mentions dates, and Rachel doesn't realize he means the edible kind.
But Applegate changed her mind, likely because Marco's dad getting married again would cause more drama/be more interesting. It never mattered to me either way, but I found it odd that Rachel would mention that, but I don't recall her mom doing anything. Then Marco starts talking about his dad dating, and I'm like "Did Applegate change her mind or something?".
Who agrees?