In regards to the first speed line. That scene lasted about 1/24th of a second. So what if you use speed lines along with actual, dynamic movement?
In regards to the second speed line scenes, that was done at the end of the episode. There originally were no speedlines, but it was the whole "to be continued" image by obscuring the overall scene.
Since your reasoning for the last two "shit" scenes is "low camera", I presume you're saying that low camer shots are bad by virtue. Have you seen what Shinkai did for the OP in ef ~ a latter tale? (If you're arguing that the scenes made poor used of the low camera, I must agree).