Flat earthers love to lie. It’s the foundation of their cult.

Einstein and detecting earth’s rotation
Misquote: “I have come to believe that the motion of the Earth cannot be detected by any optical experiment”
Actual quote: “Since then I have come to believe that the motion of the Earth cannot be detected by any optical experiment, though the Earth is revolving around the Sun.”
Liars cherry pick only part of the sentence.
Source: http://eotvos.dm.unipi.it/documents/EinsteinPapers/EinsteinInJapan1922.pdf
The first Selenelion eclipse
Flat earth liars claim the Selenelion eclipse was discovered in 1666. In reality, they were recorded and written about by Pliny the Elder, Hipparchus, and Cleomedes. Many centuries prior.
Source: https://www.jstor.org/stable/20462630
Robert Simmons and Photoshop

Lying flat earthers claim that Robert Simmons, a NASA employee, said that all photographs of the earth from space were composites. Even the ones from the 1968-1972 Apollo missions. Which were years before Photoshop or any quality computer graphics editing of photographs existed.

Robert Simmons was referring to exactly one image, the 2002 “Blue Marble”. Which was generated from many photos from satellites, an impossibility if the earth is flat. He was not talking about any other photographs like the 1972 Blue Marble photograph.
NASA never claimed the 2002 Blue Marble is a single-frame photograph. Liars like to point out that they see copy-paste effects or letters in the clouds. It doesn’t matter. The image is openly identified as a computer-edited image.
Source: https://qz.com/192700/the-guy-who-created-iphones-earth-image-explains-why-he-needed-to-fake-it/
Polish Astronaut Cherry Picking
Flat earth liars cherry-pick a small part of an interview with Polish astronaut Miroslaw Hermaszewski where he had been receiving several sarcastic questions. For example, there was a sarcastic question about aliens. In other parts of the interview, he spoke about the earth being spherical.
But flat earth liars cherry-pick the sarcastic joke.
This forum thread includes translations and analysis by fluent Polish speakers:
High Altitude Balloons
One of the flat earth scammers favorite things is to show high altitude balloon footage from a fisheye lens with carefully selected sections of the video that make the horizon look almost flat. They never give the source to the original video.
This is from a presentation given by professional flat earth liar Austin Whitsitt where he included a frame from the “Little Piggy Cam” claiming it is “reality” and comparing it to a fisheye lens.

But lying Austin didn’t mention that this is also a frame from the same “Little Piggy Cam” video:

And so is this one:

The “Little Piggy Cam” has a fisheye or barrel distorting lens.