1) Ch. 26, v. 2: "Mei'reishis" From the first Rashi (gemara M'nochos 84b) says that one only brings "bikurim" from the first-ripened produce of the seven species. This is the list of species mentioned in parshas Eikev, 8:8. Rashi here goes on to clarify the technical meaning of the words "zeis shemen" and "d'vash" in Eikev. This seems to be out of place here and should have been clarified there.
2) Ch. 26, v. 2: "V'samto ba'tenne" And you shall place it into a basket The mishnoh Bikurim 3:8 says that each person according to his financial ability brought a basket to beautify the mitzvoh. The wealthy man brought the "bikurim" in a gold or silver basket, while them poor man brought it in a wicker basket. The Sifri says that our verse teaches us that it is a requirement to bring the first-ripened produce in a basket.
We know that every mitzvoh is to be enhanced and beautified, as per the verse "Zeh Keili v'anveihu" (Shmos 15:2), which the gmera Shabbos 133b interprets to mean that we should enhance every mitzvoh. If so, why does the Torah spell it out here, since this has to be done anyway?
3) Ch. 26, v. 13: "Lo ovarti mimitzvosecho" I have not transgressed any of Your precepts Why is there a requirement to make a verbal confession specifically when bringing the required tithing, "maa'seir," to the Beis Hamikdosh?
4) Ch. 27, v. 12: "Eilu yaamdu l'vo'reich es ho'om" These will stand to bless the nation By the curse the verse does not say "to curse" "l'ka'leil," but rather, "al hakloloh," in a passive sense. Why the difference?
5) Ch. 29, v. 5: "Lechem lo achaltem v'yayin v'sheichor lo sh'si'sem l'maan teidu ki ani Hashem Elokeichem" Bread you have not eaten and wine you have not drunk so that you should know that I am your G-d Did the bnei Yisroel have absolutely no bread or wine in the desert? We see that Nodov and Avihu, the sons of Aharon drank wine, as mentioned in parshas Shmini (also see Dvorim 2:28,29).