The Raiders’ first-team offense produced two scoring drives, and rookie Ashton Jeanty gave Las Vegas a preview of things to come in a 22-19 preseason loss to the 49ers on Saturday at Allegiant Stadium.

The Raiders (0-1-1) wrap up the preseason next Saturday against the Arizona Cardinals.

Here’s three observations from the game:

1. Jeanty sharp in limited action

It was a small sample size, but Jeanty was impressive in his first home game.

The rookie from Boise State rushed for 33 yards on seven carries and caught one pass for 2 yards. The 4.7 yards per carry is what the Raiders are hoping for from their first-round pick, who flashed a little of everything during a stint that lasted just over one quarter.

Two plays stood out.

With the Raiders facing third and 5 at the 49ers’ 37-yard l

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