Knitqueen is right. If you see that you are getting a loop at the end, that's probably what you are doing. Make sure the yarn does not wrap around the needle on the first stitch.
Also, if you're switching between knit and purl anywhere in the pattern, you might be creating yarn-over increases accidentally by not having the yarn in the right position for the stitch you are making (in back for knit, in front for purl.)
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry