What lies about the polling data? The polls mostly showed that Clinton would win the popular vote. Clinton won the popular vote. They were broadly right at the end.
Whether the changes they showed during the campaign reflected actual reality is harder (actually impossible) to measure. The only true test of polling accuracy is an election, which they called broadly correctly.
The state-by-state polls I didn't follow, but I seem to remember reading vary in quality a lot more than the national ones.