Silly, silly mistake... Nope, you created a learning experience.
I've corrected entire rows of purl that should have been knit and vice versa. At some point you can decide it's faster and/or easier just to frog and redo. If you are intimidated by picking up the stitches you can run a piece of scrap yarn on a needle through them, then you won't rip beyond that point. I think it's called a lifeline, more experienced knitters probably only need it for stopping when they are doing something more intricate, I use it a lot. I am quite good at creating learning experiences.