SAN FRANCISCO, DEC. 15 -- Who's on first in the AFC? Not even the players can explain or understand what's going on this season. For example, Houston beat San Diego, 33-18, and San Diego beat Cleveland, 27-24. So what happened when Houston and Cleveland met? The Browns won, 40-7.

Entering the final two weeks of the season, 11 of the 14 teams in the AFC are in contention for the playoffs. Players don't even know who to root for while scoreboard watching. "I can see it," Miami safety Glenn Blackwood said. "One guy will call another and say, 'Buffalo beat Indianapolis. That's great!' And the other guy will say, 'Nah, that's bad.' Or, 'Seattle beat Denver, that helps.' 'Naw, that hurts.' " Instant Replay in Jeopardy

Instant replay might not get the necessary three-fourths votes to remain a part of pro football, Dallas Cowboys President Tex Schramm said yesterday.

"All you have to do is have eight votes against us. Two or three people will vote against us just because of me," said Schramm, a member of the league's competition committee, which enacted the rule.

"It irritates me that people criticize the system for the failure of the individual. We have a good system but it depends on good people to operate it."

Schramm still was angry about an interception call involving Redskins cornerback Barry Wilburn that went against the Cowboys in Sunday's loss.

Instant replay official Chuck Heberling overruled the field officials, giving Wilburn an interception. Wilburn dropped the ball during the play, but Heberling claimed the ground caused him to do so.

"Heberling said the ground cannot cause a fumble," Schramm said. "That's where he stuck his foot in his mouth. If you make a reception or interception you still must have the ball when you hit the ground. It's just the opposite of the fumble rule for a runner that says the ground can't cause a fumble."

Schramm said it was "shocking" that a replay official didn't know the rules and filed a complaint with the NFL office. "There was no excuse for the call," Schramm said. "He came up for the wrong reason to justify his bad call. Besides, no replay showed Wilburn catching the ball." . . .

The NFL Management Council has filed a motion seeking to be named specifically as a defendant in the NFL Players Assocation's suit against the league. Kelly Stouffer, the Cardinals' unsigned No. 1 draft pick, has filed a motion to be named as a plaintiff. . . .

NFL players strikes traditionally have led to many coaches being fired at the end of the season. In 1974 (after a preseason strike) there were seven coaching changes and in 1982 there were eight. This time around, only one change seems certain: Sam Wyche at Cincinnati. It seems unlikely that the Bengals will try to make quarterback Boomer Esiason and Wyche co-exist, and even though Esiason has said he'd like to be traded, he just signed a multi-year contract.

Detroit's Darryl Rogers, despite the Lions' 3-10 record, keeps getting votes of confidence (and even received a contract extension) from owner William Clay Ford. When Rogers took over the team in 1985 it finished 7-9. He followed that with a 5-11 seasom and now can finish no better than 5-10. "You don't have to be a Phi Beta Kappa to know we're going in the wrong direction," he said recently. "To be honest, a .500 season next year would be a hell of an accomplishment."

Other coaches with losing records? Since Green Bay is still a playoff contender, one would have to assume Gregg is safe. So, apparently, are Atlanta's Marion Campbell and Kansas City's Frank Gansz, both suffering through first-year assignments. The strike may have hurt Kansas City more than any team besides the Giants. Joe Walton is always rumored to be in trouble, but the Jets still have playoff hopes. . . . Bosco's Troubles Mount

Wonder why bad teams stay bad? In Green Bay, where people have somehow been comparing Randy Wright to Bart Starr, the man once touted as the quarterback of the future has yet to play a down.

Robbie Bosco, an all-America who led Brigham Young to its only national title, would have been a first-round draft pick, but was taken in the third round because of a shoulder injury he suffered late in his career.

Packers Coach Forrest Gregg now sounds as if he's ready to file for malpractice against his team's doctors. "I don't know whether Robbie Bosco will ever play again or not," Gregg said. "We had really high hopes for him. When we brought him here, we realized he had a shoulder problem. We didn't realize how much a shoulder problem until he came here, but it was obvious he couldn't play football the way he was.

"He hasn't come around. He was throwing fairly well {a month ago} then he hurt it again and hasn't thrown since. His future right now is cloudy. . . . Our doctors didn't think there was anything major wrong, but there was. A mistake was made somewhere."Upset Pick

Buffalo made it a fairly satisfying week by upsetting Indianapolis, but the Cowboys blew a perfect Sunday by playing wretchedly against the Redskins. With only two weeks left, the upset pick, at 4-11, has no chance to finish above .500, so it is picking only for pride, and goes with Tampa Bay over St. Louis and Indianapolis over San Diego.