The National Football League opens its exhibition season here Saturday with the Dallas Cowboys facing the Oakland Raiders (WJLA-TV-7, 3:30 p.m.).

The induction of Johnny Unitas, Dick Butkus, Ron Mix and Yale Lary into the Pro Football Hall of Fame, taped earlier in the day, highlights the halftime show.

The Raiders have been distracted by a feud between quarterback Ken Stabler and Al Davis, general managing partner. Stabler still insists he wants to be traded.

Oakland has a new head coach, Tom Flores, who replaced John Madden. Flores had coached the club's receivers since 1972 and was the Raider's No. 1 quarterback in 1960.

The Raiders must find replacements for three of last year's starters: wide receiver Fred Biletnikoff, running back Pbte Banaszak, and cornerback Willie Brown.

The Cowboys lost the left side of their defensive line when end Ed (Too Tall) Jones quit to become a boxer and tackle Jethro Pugh retired. One-season veteran Larry Bethea is regarded as Jones' probable successor and 12-season veteran end-tackle Larry Cole is a likely replacement for Pugh.

Of the four Hall of Fame inductees, only Unitas and Butkus are making it in their first year of eligibility, following a mandatory five-year period after retirement.

Unitas played for 18 seasons. He was with the Baltimore Colts from 1956 through 1972, and finished up at San Diego in 1973. The 6-foot-1, 195-pound graduate of the University of Louisville was an All--NFL selection five times.

He played in the third and sixth Super Bowls, four NFL championship games, one AFC title contest, and 10 Pro Bowls. He set a record by passing for at least one touchdown in 47 straight games, starting in 1956 and ending in 1960.

Butkus, 6-foot-3 and 245-pound All-America from the University of Illinois, was drafted by the Chicago Bears on the first round in 1965.

He was voted All-NFL eight times and played in eight Pro Bowls. He intercepted 22 passes and recovered 25 opponents' fumbles.

Mix, 6-foot-4 and 250 pounds, was regarded as the best offensive tackle to play in the AFL. He was drafted on the first round from Southern California by the Colts, then of the NFL, but chose to play for the Chargers of the AFL, then based in Los Angeles.

Lary, 5-foot-11 and 189 pounds, was drafted on the third round from Texas A&m by the Detroit Lions in 1952. He was a defensive back, kick returner, and punter.

His career was interrupted by military service in 1954 and 1955. Upon his return he was an All-NFL selection four times and played in nine Pro Bowls. He established a career punting average of 44.28 yards and intercepted 50 passes, two of them for touchdowns.