You're more correct than you realize. Frogs aren't reptiles. The DNA mismatch would be even worse.
The flip side, though: As to the hybrid thing, I don't think that's an ironclad rule... and this sort of hybridization is nothing like the real kind, when you should have even amounts of DNA from each donor. Here it's more like 99.9% dinosaur DNA and 0.1% "other". The creatures are technically hybrids, yes -- but effectively they really are dinosaurs. It stacks the deck more in favor of life "finding a way."