Here are a few…
Animals reproducing after their kind. Throughout the Bible, a goat is a goat and a sheep is a sheep, a horse is a horse and a donkey is a donkey. Animals are not confused. Adam named them. YEC reinterprets scripture to turn this simple concept into weird massively heterogeneous protocreatures at creation that give rise to hundreds of actual kinds, then does it again at the flood. That is not in scripture. Nobody in church history ever wrote anything like this until YEC came along, and nobody would have if all the animals in Australia, North and South America, the polar regions, and huge amounts of discovered extinct megafauna, dinosaurs, and Permian animals, had not crowded out the Ark. There is this forum thread on the topic - Is Baraminology Even Scriptural?.
The Biblical Flood was fed by springs and rain. Water came up, water went down. The rains came down and the floods came up. YEC reinterprets that to whatever geology finds to be old, the flood did it. There is nothing in scripture about earthquakes or volcanoes, reshaping the Earth, or tectonic plates, let alone chunks of Earth blasting into space. Where is the chapter and verse speaking of accelerated radioactive decay? If God wanted to destroy life on Earth, the radioactivity alone would have done the job, the Flood would not even be necessary. What is the text for magnetic reversals? Why are named rivers of Eden still present after the flood? What YEC projects into the flood story is just bizarre.
Here is one that doesn’t get a lot of mention. It is clear from history and the close Biblical Hebrew phonetic reference that the pharaoh Shishaq, who attacked Jerusalem during the reign of King Rehoboam as recorded in Kings and Chronicles, is the Egyptian Sheshonq, who left records of his exploits. Instead of simply accepting that Biblical history is validated by Egyptology, YEC contorts to identify Shishaq with earlier pharaohs, because there is far too much Egyptian history to fit to their timeline charts.