1) Ch. 16, v. 4: "Va'yishma Moshe va'yipole al ponov" – What did falling on his face accomplish?
2) Ch. 16, v. 32: "Vatiftach ho'oretz es PI'HOH" - The gemara Sanhedrin 37b says that from the time the earth opened its mouth to absorb the blood of Hevel (Breishis 4:11), it has never opened again. The difficulty from the earth opening to swallow Korach is obvious.
3) Ch. 16, v. 32: "V'eis kol horchush" – And all the possessions – Why were all of Korach’s possessions swallowed by the earth?
4) Ch. 17, v. 3: "Tzipuy lamizbei'ach" – Cladding for the altar – The Chizkuni writes that the cladding was specifically a copper roof for the altar. As Rashi explains, the altar was a four-walled box that was open on top and was filled with sand each time the Mishkon was relocated. Now a copper top was added, either being a separate plate, hinged, or perhaps permanently fixed, and from now on a sand mound was first piled up and the five-paneled altar was slipped onto the sand mound. This was to be a memorial, a remembrance of what happened. How is using the copper pans for a cover a fitting memorial?
5) Ch. 18, v. 13: "Bikurei kol asher b'artzom" – The first produce of ALL that is from their land – These words are most puzzling. The mitzvoh of tithing the first produce is limited to only seven species.