User blog comment:B214/Question and Answers/@comment-220.255.2.87-20130420091724/@comment-79.53.172.89-20130420124158

try to see the section that are present in the episode page and read the difference between anime and light novel, you'll notice that, for example, the dream where Issei see for the first time Ddraig happen into two different moment, some part of some episode of the anime are a mix of different thing from various sections of the light novel