Now some comments:

Address spelling errors in the game, though some consider this trivial compared to other issues.

Implement incentives for achieving pole position in qualifying and for beating race records during races.

Improve the replay system, which is currently seen as an "overkill" feature that is visually unappealing and repetitive.

Make sponsors earnable through gameplay achievements, such as winning a certain percentage of races or completing specific game sections (e.g., finishing the GT Pacific championship for new sponsors), rather than being developer-placed on specific cars.

Increase the variety of paint schemes, with at least two exclusive schemes per car, to avoid player frustration like spending $8 million credits on an Impreza with a "crappy" paint scheme.

Increase the garage capacity beyond 100 cars, or allow players to pay a fee to expand it.

Enforce car class restrictions to prevent overpowered cars like the Escudo from dominating inappropriate race classes, or revert to a system similar to Gran Turismo 1's race-mode and normal-mode distinction, requiring more credit expenditure.

Consider implementing a betting system to increase jackpot chances and potential winnings.

Revise Endurance races to offer one special, non-purchasable prize car and reduce laps to 10-20.

Rework the jackpot system to reward racers who reach the finish line first within a limited time.

Add an in-car view, as it was omitted in Gran Turismo 2 and is present in other racing games.

Record race records, rather than relying solely on time trials.

Remove random ordering of prize cars and offer only one prize car per individual race.

Implement a save option after each race when using a 5-race prize structure (like GT300 style) to accommodate players with limited playtime.

Allow players to hire a professional mechanic as an "advisor" for full modifications.

Introduce a Used Car Center specializing in fully tuned cars.

Consolidate tuning centers and clearly indicate which parts, like Bore & Stroke, cannot be purchased to prevent player frustration.

Establish a Main Used Car Centre selling a wide variety of European, Japanese, US, Korean, and Malaysian cars from all manufacturers.

Increase the number of computer opponents (e.g., from 6 to 10) or raise the game's difficulty, which is perceived as simpler than Gran Turismo 1.

Introduce more challenging tracks that require significant learning and practice to master.

Investigate the availability of the exclusive McLaren F1, as some players have not encountered it despite acquiring many other cars.

Address glitches such as computer-controlled cars suddenly stopping during races, particularly in endurance events like Seattle/Apricot Hill (observed in the Japanese version).

Clarify if completing license tests with gold medals contributes to the overall game completion percentage.

Consider implementing a system to track cars using a database, allowing sorting by drivetrain and other attributes.