I think there have been cave paintings made by ancient humans who drew what looks like dinosaurs.
As well as some sea ships whom claims to have encountered living specimens who have an uncanny resemblance to some potential aquatic life thought to be extinct.
There are also a few mysteries where footprints of human beings and dinosaurs are imprinted overlapping one another. Some ancient species have (officially) been witnessed and cataloged out at sea who were once thought to be extinct.
At the very least there are plenty of questions and some inconsistencies in the established plotline of the history of the Earth.
Edit:
The latest addition to the plotline in the last century is that there were multiple species of human beings who once were in a cohabit with each other and intermingling.