Interviewers judge your whiteboard before your words. A complete crossing sketch has five elements, always in the same places, so the interviewer reads it instantly and you never forget a piece under pressure.
Launch flop with its clock. Label the clock name and rate. Everything about direction and ratio follows from these two labels.
Capture flop with its clock. Different clock net, different domain: say so out loud while drawing.
The synchroniser between them, drawn as a box with its scheme named (two-flop, toggle, handshake, FIFO). Never draw a bare wire and call it synchronised.
Data and valid timing. For buses, draw which signal is data and which is the qualify or acknowledge, and state the hold rule: data stable until the destination has it.
The failure arrow. Mark where the failure you are discussing happens: a star at the capture flop for metastability, a gap between slow edges for a lost pulse, a split bus for tearing.
First, the lost pulse: draw fast launch, slow capture, and mark the pulse falling between two slow edges. Second, the torn bus: draw four bits changing at once with one synchroniser per bit, and circle the mixed old-new capture. Both sketches take under a minute and both invite the interviewer to ask the follow-up you want. The underlying mechanisms are taught in Failure Modes and the toggle synchroniser lesson.
Launch flop with its clock, capture flop with its clock, the named synchroniser scheme between them, data-versus-valid timing with the hold rule, and a mark showing where the failure under discussion happens.