Yeah, a lot of copyright law in the US is extremely forgiving towards creators making mistakes. For example, you can only file for damages after you register the copyright, but you can register after the damages. So like if I made a book, someone stole it and starting selling copies, I could register for a copyright afterwards. Which honestly is for the best. Everything you make inherently has copyright. This comment, once I click send, will be copyrighted. It would just senselessly create extra work for the government and small creators if everything needed to be registered to get the protections.