@Skinny, thank you for the tips. Yeah, I think color-masking the green and changing it to the similar hue and saturation as the paper will help remedy this. I really didn't notice that green artifact until someone here pointed it out. But I am really aware that artifacts may occur in my 1080 shots, and I don't really mind with that because I focus more on the overall image, such as color, composition and exposure.
For color grading, I did it mainly in the MLV app, exported as Prores, and refined some color (if necessary) in Final Cut Pro while editing the sequence. BTW, some of the shots in this video were in Dual ISO.