Ungrouping made me lose my key frames for movement and zooming in.

I’m animating a camera paneling up and zooming into a car. After I drew up everything, I grouped all my layers, used move/scale keyframes on the group’s track, and then I ungrouped the layers so that I could add special luminescent effects to the headlights. After what I “thought” completed the animation, I had to ungroup my layers to add more color to the outside of the stage so that there wasn’t white when the camera panels up. But I realized that ungrouping the layers would deplete all my other work with the camera movement/scale/zooming keyframes.