This isn't the first recall for the 918 Spyder. We've seen one for a wiring harness issue before and another small recall for a faulty rear control arm. This recall is a voluntary safety recall that deals with the possibility of mismatched screws on the seatbelt mounts and belt reels. Here's what Porsche had to say about the issue.
The original parts catalog for the 918 Spyder inadvertently transposed the locations for the screws which respectively secure the seat belt mount and the belt reel mount. These screws are one-time-use only and are not the same. We cannot rule out the possibility that, due to the mistake in the catalog, technicians who had to work on those components might have been led to install the wrong screw in the wrong location. In that event, the function of the seat belt system could possibly be impaired in the event of an accident. To prevent this risk, the fastening screws on the seat belt mount and on the belt reel on all 918 Spyder vehicles will be checked. Depending upon the result of the check, Porsche might replace the screws on some vehicles. In an abundance of caution, Porsche is treating this as a safety-related recall and will make contact with all owners. The mistake in the parts catalog already has been corrected.
Right now, it looks like the recall is only for those 918s delivered to the U.S. However, as this was a result of a "catalog" issue, it's quite possible it could expand to other countries. Porsche will notify each owner to have their 918 inspected.