At 15.45, an ambulance can be seen. The number plate reads DE32TQT. This is a false plate as it is not possible for this to be a general number plate until March 2032.
The signage for the criminology conference is engraved on large rigid plaques (wood or imitation). This seems unnecessarily and improbably extravagant. Signage in venues like this is usually simply printed on card (possibly laminated or inserted in frames) or put on electronic display screens.
Haiden was killed by a single blow to the back of his head. His watch was broken and Dan suggested that could have been caused by him trying to defend himself. That would only happen if he was defending against an attack from the front.
Tempest also suggested that the damage to the watch was consistent with an attempt to ward off the attack, but he already knew the Haiden had been attacked from behind.