Insert the Rugrats: Search for Reptar disc into your CD-ROM drive and enter the data directory. Once you're inside click hints for access to 42 text files which contain hints for the game.
Also you are able to play as Reptar in a bonus level by completing the game after collecting a minimum of 12 Reptar Bars.
Simply just throw the bone at him and he will bring it back to you.
When you are going down stairs, press X at the right time causing you to not have to keep bouncing to get down. This is a good idea to do when you are playing Chuckie's Glasses when you are trying to race someone from upstairs.
If you want to know how to do this, get every Reptar Bar in the mini game and you will unlock him as a playable character.
In the cut scene in Chuckie's Glasses Lil says "How about hide and go seek?" put the camera really points to Phil and it looks like Phil is actually saying that.
When you are doing the pyramid hole on the golf level, head around the back of the big pyramid to go inside and find a mummy + Reptar bars!