Yes, they are quite common.
Pilots usually know when a lightning strike has occurred. Engineers will also know what to look for and will likely see evidence of a lightning strike as they do their walk-around.
Maintenance-wise, there will be an inspection carried out to identify any skin damage from the lightning strike. 99.9% of damage from lightning strikes is superficial, paint damage and maybe some rivets or static wicks damaged, depending where the strike enters and exits the aircraft. It's very rare that a strike will significantly damage the aircraft, as they're designed to withstand lightning strikes.
If it's really bugging you, you can always call SIA and let them know the details. Either they'll already know, or they'll be happy for the information.