I'm not sure I would call those tactics "Bait and Switch" but I understand where you are coming from.
Another common one that I've seen with regards to Carbon dating is using dates from contaminated samples to try to show that the entire process is flawed.
For example, trying to carbon date a recently dead seal and getting an age of several thousand years. They never mention that the oceans are a vast holding tank for carbon and anything that lives in, or lives off of creatures in the ocean will be dated much older then they actually are.