1) Ch. 6, v. 9: "B'dorosov" In his generations Rashi says that some deduce from this word that had Noach lived in the generation of Avrohom he would had been considered negligible, a pejorative explanation. Why would one interpret negatively if it is just as easy to interpret positively, as is the opinion of our Rabbis, which is mentioned earlier in this Rashi?
2) Ch. 7, v. 2: "Mikole habheimoh hat'horoh" From each ritually pure animal The gemara Z'vochim 116a asks, "Were there then kosher and non-kosher species at the time of the great deluge?" The gemara answers that this refers to those that would be kosher and non-kosher in the future. The gemara then asks, "How indeed did Noach know to differentiate?" The gemara answers that Noach brought the animals in front of the ark and those that were able to enter were the future kosher species from which he took seven. Our Rashi says that Noach knew because he learned the teachings of the Torah. If so, why does the gemara say that Noach passed them in front of the ark to know?"
3) Ch. 7, v. 2: "Hat'horoh tikach l'cho asher lo t'horoh hee shnayim" The ritually pure you shall TAKE for yourself that is not ritually pure two Why by the kosher species does the verse say TAKE and by the non-kosher is there no mention of taking?
4) Ch. 7, v. 14: "Ho'ofe tzipor" Bird .. bird What is the difference between these two words?
5) Ch. 8, v. 2: "Va'yiko'lei ha'geshem" And the rain ended We find the word "va'yiko'lei" in one other place in the Torah, "va'yiko'lei ho'om mei'hovi" (Shmos 36:6), and the nation ended bringing. What is the connection?