A client device of a game streaming system generates an overlay that identifies discontinuities and other changes in features between streamed frames. The client device receives a stream of frames, representing game content for display, from a server via a network. The client device analyzes the received frames to identify discontinuities and other changes in features of the plurality of frames, such as a particular feature changing one or more of position, size, texture, or other visual characteristic between successively received frames. The client device generates the overlay to indicate the identified features and displays the overlay with at least one of the received frames.