1) Ch. 21, v. 8: "V'kidashto …… kodosh yi'h'yeh loch" - Rashi (gemara Gitin 59b) says that we sanctify the Kohein by giving him the first turn and honouring him to lead the grace after meals.
These days those whom we consider as Kohanim are people who have had this status from generation to generation, i.e. the previous generation tells us that the fathers of today's Kohanim received the first "aliyoh," that they "duchaned," gave the priestly benediction, etc.
If a complete stranger comes to a community and claims that he is a Kohein, do we believe him? If yes, to what extent?
2) Ch. 21, v. 10: "V'haKohein hagodol mei'echov asher yutzak al rosho shemen hamish'choh u'mi'lei es yodo lilbosh es habgodim es rosho lo yifro u'v'godov lo yifrome" - Couldn't the verse have left out the words "asher yutzak al rosho shemen hamish'choh u'mi'lei es yodo lilbosh es habgodim" and simply have stated that the Kohein Godol should not let his hair be unkempt and should not rent his garments as signs of mourning?
3) Ch. 21, v. 19: "Shever regel o shever yad" - If the Kohein has a bone fracture in his leg or hand he is disqualified from serving. Similarly if the sacrifice has a bone fracture it is disqualified as mentioned in 22:22. Why does our verse describe the fracture as "shever regel o shever yad" and in verse 22 as "shovur?"
4) Ch. 23, v. 13: "U'minchoso shnei esronim so'les" - we say in the "musof" prayers of Yom Tov, "U'minchosom v'niskeihem kimdubor - And their meal offerings and libations as is stated, shloshoh esronim lapor, u'shnei esronim lo'oyil, v'isorone la'keves, - three tens (of an eifoh) for an ox, two tenths for a ram, and a tenth for a lamb," clearly detailing the volume of flour for each type of animal, while regarding the libation of wine we say, "v'ya'yin k'nisko, - and wine as is appropriate for its libation" without itemizing the different volumes for an ox, ram, and lamb?
5) Ch 24, v. 12: "Lifrosh lohem al pi Hashem" – Rashi says that the incident of the blasphemous son of Shlomis bas Divri and that of Tz'lofchod took place in the same period of time. However, the two cases differed in that by Tz'lofchod the court knew that he was deserving of death, but not which of the four types of death administered by the court, as the verse says (Bmidbar 15:34), "ki lo forash mah yei'o'seh lo." In contrast, by the blasphemer, they didn't even know if he was deserving of death (T.K. 24:237), as it says here, "lifrosh lohem."
(We find the same words, "mah yei'o'seh lo," by the incident of Moshe being cast into the "suf" where his sister Miriam stood at a distance to find out "mah yei'o'seh lo." We can similarly interpret this to mean that she knew that he would definitely be saved, but stood and watched to see what form of rescue would take place.) Why didn't they know that he was culpable of the death penalty? Since one receives the death penalty for cursing his father or mother, surely for doing so to Hashem one deserves death as well.