crwflags.com

Z81LG TIL thanks to an erroneous description of a US Customs flag in Nathaniel Hawthorne's "The Scarlet Letter", since the 1870s there's been a popular conspiracy theory that the USA has an official alternative flag, the "Civil Flag", with vertical stripes.
neMlG TIL most flags, when hung vertically should be flipped to keep the "honour point" still in the top left.
JY5bl TIL that from 1977-2011, the national flag of Libya was literally a green rectangle