As the 2024 NFL season progresses into Week 4, several key developments and performances have captured the attention of football fans.

### Unbeaten Teams
The Kansas City Chiefs and Buffalo Bills remain undefeated, each boasting a 3-0 record. The Chiefs, despite some inconsistencies in their dynamic offense, have managed to win close games, including a recent victory over the Atlanta Falcons. Their main issue on offense is red zone scoring, converting touchdowns on only 44% of their trips inside the 20-yard line.

The Buffalo Bills, led by Josh Allen's impressive performances, have dominated their opponents, including a decisive win over the Jacksonville Jaguars. Buffalo currently leads the league in scoring with 112 points, alleviating concerns about the team's direction after a tumultuous offseason.

### Other Notable Teams
The Minnesota Vikings, under Sam Darnold, have emerged as a surprise contender with a 3-0 record. Their defense, orchestrated by Brian Flores, has been particularly effective, making them a team to watch this season.

The Pittsburgh Steelers, also 3-0, have benefited from Mike Tomlin's coaching and a strong defense that ranks first in passing yards allowed and second in total yards allowed. However, their schedule has been relatively easy so far.

### Key Performances and Issues
- The New Orleans Saints saw their high-powered offense falter against the Philadelphia Eagles, largely due to injuries to center Erik McCoy and tight end Taysom Hill. These injuries significantly impacted their offensive output.
- The Green Bay Packers are struggling with penalties, particularly on offense, where they have the most holding infractions in the league.
- The San Francisco 49ers are facing a lack of yards after the catch (YAC), a significant drop from their 2023 performance, partly due to injuries to key players like Deebo Samuel, Christian McCaffrey, and George Kittle.

### Pass Rushing
Myles Garrett of the Cleveland Browns has taken the top spot in PFF's pass-rusher rankings after Week 3, with a 44.0% win percentage and a 36.0% pressure percentage. Jalen Carter also had a standout performance, earning a league-best 93.9 PFF pass-rushing grade for the week.

### Injuries and Roster Updates
Austin Ekeler of the Washington Commanders has been ruled out for Week 4 due to a concussion. Other teams are also dealing with various injuries that could impact their performances in the coming weeks.

### Rookie Struggles
Caleb Williams, the top overall pick in the 2024 draft, has had a challenging start with the Chicago Bears. Despite achieving a career-high in passing yards and recording his first two touchdown passes against the Indianapolis Colts, Williams is facing typical rookie struggles.

As the season moves forward, these early trends and performances will continue to shape the landscape of the NFL, setting the stage for potential playoff matchups and highlighting the strengths and weaknesses of each team.