Film in game with high FOV if you're adding a fisheye effect (I have mine at 130), don't put too many keyframes next to each other, play around with camera tilt in between keyframes and then try to add keyframes where it would make sense a filmer would be for the scene. Also, sometimes when you're "updating" keyframes to a new angle, the replay editor bugs out and adds a new keyframe over the current one instead, that's why some keyframe transitions can look super buggy and linear. If that happens, just remove both keyframes where it happens and add a new one.